<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a025b9-da04-7c7b-9d53-4b50a4ae6081,g:b547778b-881b-41dd-9f72-15d8e233e76b-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.bowman.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY" xlink:type="simple" xlink:href="bwmn-20260930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_01a025b9-db60-7b36-8978-7c2b3c74a7ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_01a025b9-db60-793a-a70b-6ba5fd523be1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_01a025b9-db60-7b36-8978-7c2b3c74a7ba" xlink:to="loc_us-gaap_StatementTable_01a025b9-db60-793a-a70b-6ba5fd523be1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_01a025b9-db60-7e47-b09a-4f9cec9ae19a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01a025b9-db60-793a-a70b-6ba5fd523be1" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_01a025b9-db60-7e47-b09a-4f9cec9ae19a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a025b9-db60-7e47-b09a-4f9cec9ae19a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a025b9-db60-7e47-b09a-4f9cec9ae19a" xlink:to="loc_us-gaap_EquityComponentDomain_01a025b9-db60-7e47-b09a-4f9cec9ae19a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a025b9-db60-729b-9895-db8bc53410bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a025b9-db60-7e47-b09a-4f9cec9ae19a" xlink:to="loc_us-gaap_EquityComponentDomain_01a025b9-db60-729b-9895-db8bc53410bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a025b9-db60-7fa3-99ab-5d8ce847f2fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a025b9-db60-729b-9895-db8bc53410bb" xlink:to="loc_us-gaap_CommonStockMember_01a025b9-db60-7fa3-99ab-5d8ce847f2fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_01a025b9-db60-7db6-b81c-401533150ae5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a025b9-db60-729b-9895-db8bc53410bb" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_01a025b9-db60-7db6-b81c-401533150ae5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_01a025b9-db60-74a4-9a73-2aa2776894a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a025b9-db60-729b-9895-db8bc53410bb" xlink:to="loc_us-gaap_TreasuryStockCommonMember_01a025b9-db60-74a4-9a73-2aa2776894a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a025b9-db60-78ca-bd34-7a0c60b3be48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a025b9-db60-729b-9895-db8bc53410bb" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a025b9-db60-78ca-bd34-7a0c60b3be48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesFromStockholderMember_01a025b9-db60-773f-91d6-eb5bd9a11a08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivablesFromStockholderMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a025b9-db60-729b-9895-db8bc53410bb" xlink:to="loc_us-gaap_ReceivablesFromStockholderMember_01a025b9-db60-773f-91d6-eb5bd9a11a08" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_01a025b9-db60-7dda-8722-f2a2ebf1ad2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a025b9-db60-729b-9895-db8bc53410bb" xlink:to="loc_us-gaap_RetainedEarningsMember_01a025b9-db60-7dda-8722-f2a2ebf1ad2e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a025b9-db60-7b36-8978-7c2b3c74a7ba" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_01a025b9-db60-7cab-bb1d-48a4be3c4822" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_01a025b9-db60-7cab-bb1d-48a4be3c4822" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_01a025b9-db60-7c51-8218-afcd42568dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockholdersEquity_01a025b9-db60-7c51-8218-afcd42568dfb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_01a025b9-db60-7f4f-bd48-7a3c626b82f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_TreasuryStockCommonShares_01a025b9-db60-7f4f-bd48-7a3c626b82f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_01a025b9-db60-7d9a-a475-e9a63f7a55ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_01a025b9-db60-7d9a-a475-e9a63f7a55ec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_01a025b9-db60-73d4-8e19-9059dc14607e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_01a025b9-db60-73d4-8e19-9059dc14607e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_01a025b9-db60-7a3a-85b9-3131a7a3f990" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_01a025b9-db60-7a3a-85b9-3131a7a3f990" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredParValueMethod_01a025b9-db60-701c-8170-4102a2a021fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredParValueMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredParValueMethod_01a025b9-db60-701c-8170-4102a2a021fb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_01a025b9-db60-7fd6-bd40-bfa2559e6f14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_01a025b9-db60-7fd6-bd40-bfa2559e6f14" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_01a025b9-db60-7d5e-b121-2d2d9495754c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_01a025b9-db60-7d5e-b121-2d2d9495754c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_01a025b9-db60-7d7c-9908-fc26a6f1caee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_01a025b9-db60-7d7c-9908-fc26a6f1caee" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_01a025b9-db60-7a6d-b5bf-1f1764c9161b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_01a025b9-db60-7a6d-b5bf-1f1764c9161b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_01a025b9-db60-7477-a70f-c7fb14ec0242" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_01a025b9-db60-7477-a70f-c7fb14ec0242" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_01a025b9-db60-7b17-b9b9-af2df15a7847" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_01a025b9-db60-7b17-b9b9-af2df15a7847" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_CollectionsOnStockSubscriptionNotesReceivable_01a025b9-db60-7aa5-b138-ed969beaba07" xlink:href="bwmn-20260930.xsd#bwmn_CollectionsOnStockSubscriptionNotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_bwmn_CollectionsOnStockSubscriptionNotesReceivable_01a025b9-db60-7aa5-b138-ed969beaba07" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_01a025b9-db60-74ae-a2c9-140953d75492" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_01a025b9-db60-74ae-a2c9-140953d75492" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_01a025b9-db60-799e-928f-a113854b7778" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_01a025b9-db60-799e-928f-a113854b7778" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_01a025b9-db60-75d5-8c13-97f805ac2c9a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_01a025b9-db60-75d5-8c13-97f805ac2c9a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_01a025b9-db60-79b0-9031-a991d89a731e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_01a025b9-db60-79b0-9031-a991d89a731e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_01a025b9-db60-7501-a206-4f26f8b6c781" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_01a025b9-db60-7501-a206-4f26f8b6c781" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_01a025b9-db60-7a91-91c3-7191790ca769" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a025b9-db60-78bb-9e9a-7f4b5a968ca4" xlink:to="loc_us-gaap_NetIncomeLoss_01a025b9-db60-7a91-91c3-7191790ca769" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_01a025b9-db60-74f0-bf70-2f692f2cc5a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_01a025b9-db60-7b45-a4fb-814e9340a745" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_01a025b9-db60-7000-af06-a6d4ad145adc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/NatureofBusinessandBasisofPresentationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#NatureofBusinessandBasisofPresentationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/NatureofBusinessandBasisofPresentationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_NatureOfBusinessAndBasisOfPresentationLineItems_01a025b9-db61-7427-a70b-b81561575740" xlink:href="bwmn-20260930.xsd#bwmn_NatureOfBusinessAndBasisOfPresentationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_NatureOfBusinessAndBasisOfPresentationTable_01a025b9-db61-7168-8f83-5336ef4cc025" xlink:href="bwmn-20260930.xsd#bwmn_NatureOfBusinessAndBasisOfPresentationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bwmn_NatureOfBusinessAndBasisOfPresentationLineItems_01a025b9-db61-7427-a70b-b81561575740" xlink:to="loc_bwmn_NatureOfBusinessAndBasisOfPresentationTable_01a025b9-db61-7168-8f83-5336ef4cc025" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_01a025b9-db61-7e84-8388-c58fe62ca066" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bwmn_NatureOfBusinessAndBasisOfPresentationTable_01a025b9-db61-7168-8f83-5336ef4cc025" xlink:to="loc_srt_StatementGeographicalAxis_01a025b9-db61-7e84-8388-c58fe62ca066" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_01a025b9-db61-7e84-8388-c58fe62ca066_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_01a025b9-db61-7e84-8388-c58fe62ca066" xlink:to="loc_srt_SegmentGeographicalDomain_01a025b9-db61-7e84-8388-c58fe62ca066_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_01a025b9-db61-7a63-9ddc-92ab1d699424" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_01a025b9-db61-7e84-8388-c58fe62ca066" xlink:to="loc_srt_SegmentGeographicalDomain_01a025b9-db61-7a63-9ddc-92ab1d699424" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_01a025b9-db61-7010-9085-e0eb35450418" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_01a025b9-db61-7a63-9ddc-92ab1d699424" xlink:to="loc_country_US_01a025b9-db61-7010-9085-e0eb35450418" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_01a025b9-db61-76de-a37f-0512531eaf0f" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_01a025b9-db61-7a63-9ddc-92ab1d699424" xlink:to="loc_country_MX_01a025b9-db61-76de-a37f-0512531eaf0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_NumberOfOffices_01a025b9-db61-7340-ba55-1f54b7941a54" xlink:href="bwmn-20260930.xsd#bwmn_NumberOfOffices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bwmn_NatureOfBusinessAndBasisOfPresentationLineItems_01a025b9-db61-7427-a70b-b81561575740" xlink:to="loc_bwmn_NumberOfOffices_01a025b9-db61-7340-ba55-1f54b7941a54" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/SignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#SignificantAccountingPoliciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/SignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductInformationLineItems_01a025b9-db61-7111-ace5-88dc7414cd8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfProductInformationTable_01a025b9-db61-797d-9895-dbdf841b5966" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfProductInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ProductInformationLineItems_01a025b9-db61-7111-ace5-88dc7414cd8e" xlink:to="loc_us-gaap_ScheduleOfProductInformationTable_01a025b9-db61-797d-9895-dbdf841b5966" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-79b9-bfad-6add0399229b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfProductInformationTable_01a025b9-db61-797d-9895-dbdf841b5966" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-79b9-bfad-6add0399229b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-79b9-bfad-6add0399229b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-79b9-bfad-6add0399229b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-79b9-bfad-6add0399229b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-77ac-ba55-4cf0160b9969" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-79b9-bfad-6add0399229b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-77ac-ba55-4cf0160b9969" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_SurdexCorporationMember_01a025b9-db61-7740-b8be-2a71773143cb" xlink:href="bwmn-20260930.xsd#bwmn_SurdexCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-77ac-ba55-4cf0160b9969" xlink:to="loc_bwmn_SurdexCorporationMember_01a025b9-db61-7740-b8be-2a71773143cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_LongTermContractsPaymentTerm_01a025b9-db61-7f1b-a1d7-c6806fa2238f" xlink:href="bwmn-20260930.xsd#bwmn_LongTermContractsPaymentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_01a025b9-db61-7111-ace5-88dc7414cd8e" xlink:to="loc_bwmn_LongTermContractsPaymentTerm_01a025b9-db61-7f1b-a1d7-c6806fa2238f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_01a025b9-db61-7ce6-9496-fc18f3930cef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_01a025b9-db61-7111-ace5-88dc7414cd8e" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_01a025b9-db61-7ce6-9496-fc18f3930cef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_01a025b9-db61-7d2a-b820-09d419f61d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_01a025b9-db61-7111-ace5-88dc7414cd8e" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_01a025b9-db61-7d2a-b820-09d419f61d7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_01a025b9-db61-7b0d-931b-26b0b571641d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_01a025b9-db61-7111-ace5-88dc7414cd8e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_01a025b9-db61-7b0d-931b-26b0b571641d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_01a19a19-1d24-7e11-9db3-ea9dab1f92e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_01a025b9-db61-7111-ace5-88dc7414cd8e" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_01a19a19-1d24-7e11-9db3-ea9dab1f92e0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_01a025b9-db61-7c2e-8944-2f932e774d8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_01a025b9-db61-7111-ace5-88dc7414cd8e" xlink:to="loc_us-gaap_NumberOfOperatingSegments_01a025b9-db61-7c2e-8944-2f932e774d8b" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/SignificantAccountingPoliciesSummaryofChangeinContingentConsiderationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#SignificantAccountingPoliciesSummaryofChangeinContingentConsiderationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/SignificantAccountingPoliciesSummaryofChangeinContingentConsiderationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionContingentConsiderationLineItems_01a025b9-db61-7be4-a420-c2c5f7811837" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetAcquisitionContingentConsiderationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionContingentConsiderationTable_01a025b9-db61-7de5-8f09-7f7fce0a296c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetAcquisitionContingentConsiderationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AssetAcquisitionContingentConsiderationLineItems_01a025b9-db61-7be4-a420-c2c5f7811837" xlink:to="loc_us-gaap_AssetAcquisitionContingentConsiderationTable_01a025b9-db61-7de5-8f09-7f7fce0a296c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_01a025b9-db61-791b-9a12-f7f24d445884" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AssetAcquisitionContingentConsiderationTable_01a025b9-db61-7de5-8f09-7f7fce0a296c" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_01a025b9-db61-791b-9a12-f7f24d445884" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a025b9-db61-791b-9a12-f7f24d445884_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a025b9-db61-791b-9a12-f7f24d445884" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a025b9-db61-791b-9a12-f7f24d445884_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a025b9-db61-78fd-8a59-6c1920a86580" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_01a025b9-db61-791b-9a12-f7f24d445884" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a025b9-db61-78fd-8a59-6c1920a86580" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ContingentConsiderationMember_01a025b9-db61-7ea2-9fef-219d0477ece6" xlink:href="bwmn-20260930.xsd#bwmn_ContingentConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_01a025b9-db61-78fd-8a59-6c1920a86580" xlink:to="loc_bwmn_ContingentConsiderationMember_01a025b9-db61-7ea2-9fef-219d0477ece6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a025b9-db61-7e89-aaa1-8633a06d701f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionContingentConsiderationLineItems_01a025b9-db61-7be4-a420-c2c5f7811837" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a025b9-db61-7e89-aaa1-8633a06d701f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_01a025b9-db61-7d34-9dc8-83024651a45b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a025b9-db61-7e89-aaa1-8633a06d701f" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_01a025b9-db61-7d34-9dc8-83024651a45b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_01a025b9-db61-7dc1-82f4-8b38797549f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a025b9-db61-7e89-aaa1-8633a06d701f" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_01a025b9-db61-7dc1-82f4-8b38797549f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_01a025b9-db61-7ff9-9ff7-dae9f7840bef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a025b9-db61-7e89-aaa1-8633a06d701f" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_01a025b9-db61-7ff9-9ff7-dae9f7840bef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_01a025b9-db61-730f-a2cd-7e839f59fb25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a025b9-db61-7e89-aaa1-8633a06d701f" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_01a025b9-db61-730f-a2cd-7e839f59fb25" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_01a025b9-db61-7de6-8598-0b91b10d4a47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/EarningsLossPerShareandCertainRelatedInformationAdditionalInformationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#EarningsLossPerShareandCertainRelatedInformationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/EarningsLossPerShareandCertainRelatedInformationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a025b9-db61-7f75-b580-bbcc7d56b30c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_01a025b9-db61-7308-9249-aff120456020" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a025b9-db61-7f75-b580-bbcc7d56b30c" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_01a025b9-db61-7308-9249-aff120456020" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_01a025b9-db61-7454-abb3-adf37499334f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_01a025b9-db61-7308-9249-aff120456020" xlink:to="loc_srt_ShareRepurchaseProgramAxis_01a025b9-db61-7454-abb3-adf37499334f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_01a025b9-db61-7454-abb3-adf37499334f_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_01a025b9-db61-7454-abb3-adf37499334f" xlink:to="loc_srt_ShareRepurchaseProgramDomain_01a025b9-db61-7454-abb3-adf37499334f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_01a025b9-db61-751c-bd60-c05abccde3e5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_01a025b9-db61-7454-abb3-adf37499334f" xlink:to="loc_srt_ShareRepurchaseProgramDomain_01a025b9-db61-751c-bd60-c05abccde3e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_A2025RepurchaseAuthorizationMember_01a025b9-db61-7bfd-abb1-bfe4d8f16c80" xlink:href="bwmn-20260930.xsd#bwmn_A2025RepurchaseAuthorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_01a025b9-db61-751c-bd60-c05abccde3e5" xlink:to="loc_bwmn_A2025RepurchaseAuthorizationMember_01a025b9-db61-7bfd-abb1-bfe4d8f16c80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesRestrictedStock_01a025b9-db61-7dc6-9d3a-d27a1026b210" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesRestrictedStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a025b9-db61-7f75-b580-bbcc7d56b30c" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesRestrictedStock_01a025b9-db61-7dc6-9d3a-d27a1026b210" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesIssuedBasic_01a025b9-db61-70dd-b950-0502f5592d4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesIssuedBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a025b9-db61-7f75-b580-bbcc7d56b30c" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesIssuedBasic_01a025b9-db61-70dd-b950-0502f5592d4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_01a025b9-db61-7f91-abb6-a06ffe2600ec" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a025b9-db61-7f75-b580-bbcc7d56b30c" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_01a025b9-db61-7f91-abb6-a06ffe2600ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramPeriodInForce1_01a025b9-db61-76b7-96c9-320b0374a8f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchaseProgramPeriodInForce1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a025b9-db61-7f75-b580-bbcc7d56b30c" xlink:to="loc_us-gaap_StockRepurchaseProgramPeriodInForce1_01a025b9-db61-76b7-96c9-320b0374a8f3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_01a025b9-db61-7837-a0f2-b7f84cfd722a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a025b9-db61-7f75-b580-bbcc7d56b30c" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_01a025b9-db61-7837-a0f2-b7f84cfd722a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_01a025b9-db61-77b0-ba49-1ac6590c3ad9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a025b9-db61-7f75-b580-bbcc7d56b30c" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_01a025b9-db61-77b0-ba49-1ac6590c3ad9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_01a025b9-db61-7809-9794-591f808094e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a025b9-db61-7f75-b580-bbcc7d56b30c" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_01a025b9-db61-7809-9794-591f808094e3" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/AcquisitionsAdditionalInformationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#AcquisitionsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/AcquisitionsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7cb2-b138-7bd2dbc88a27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7cb2-b138-7bd2dbc88a27" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-701c-8378-a6b61d9d4cba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7cb2-b138-7bd2dbc88a27" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-701c-8378-a6b61d9d4cba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-701c-8378-a6b61d9d4cba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-701c-8378-a6b61d9d4cba" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-701c-8378-a6b61d9d4cba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7522-8de9-7de7241c231c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-701c-8378-a6b61d9d4cba" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7522-8de9-7de7241c231c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_A2026AcquisitionsMember_01a025b9-db61-7ff6-ba5b-d6a36857e0a0" xlink:href="bwmn-20260930.xsd#bwmn_A2026AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7522-8de9-7de7241c231c" xlink:to="loc_bwmn_A2026AcquisitionsMember_01a025b9-db61-7ff6-ba5b-d6a36857e0a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_A2025AcquisitionsMember_01a025b9-db61-76ad-9f55-abd0350d6525" xlink:href="bwmn-20260930.xsd#bwmn_A2025AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7522-8de9-7de7241c231c" xlink:to="loc_bwmn_A2025AcquisitionsMember_01a025b9-db61-76ad-9f55-abd0350d6525" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_RTPAllianceLLCMember_01a025b9-db61-7610-a5e5-3db8ec29fdd9" xlink:href="bwmn-20260930.xsd#bwmn_RTPAllianceLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7522-8de9-7de7241c231c" xlink:to="loc_bwmn_RTPAllianceLLCMember_01a025b9-db61-7610-a5e5-3db8ec29fdd9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-7904-8b4a-34f4821d9b09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7522-8de9-7de7241c231c" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-7904-8b4a-34f4821d9b09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-798f-aab8-f89dc3f5939d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7cb2-b138-7bd2dbc88a27" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-798f-aab8-f89dc3f5939d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-798f-aab8-f89dc3f5939d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-798f-aab8-f89dc3f5939d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-798f-aab8-f89dc3f5939d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-70ac-8f9c-53b41ecf12d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-798f-aab8-f89dc3f5939d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-70ac-8f9c-53b41ecf12d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_01a025b9-db61-76d5-a380-037c3144917f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-70ac-8f9c-53b41ecf12d1" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_01a025b9-db61-76d5-a380-037c3144917f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_PromissoryNoteMember_01a025b9-db61-76f0-aba1-4e6310b2d364" xlink:href="bwmn-20260930.xsd#bwmn_PromissoryNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-70ac-8f9c-53b41ecf12d1" xlink:to="loc_bwmn_PromissoryNoteMember_01a025b9-db61-76f0-aba1-4e6310b2d364" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleNotesPayableMember_01a025b9-db61-75bf-9271-afb78920a48c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleNotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-70ac-8f9c-53b41ecf12d1" xlink:to="loc_us-gaap_ConvertibleNotesPayableMember_01a025b9-db61-75bf-9271-afb78920a48c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a025b9-db61-786a-ad05-e1a01191c838" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7cb2-b138-7bd2dbc88a27" xlink:to="loc_srt_RangeAxis_01a025b9-db61-786a-ad05-e1a01191c838" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-786a-ad05-e1a01191c838_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a025b9-db61-786a-ad05-e1a01191c838" xlink:to="loc_srt_RangeMember_01a025b9-db61-786a-ad05-e1a01191c838_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-7ef0-bf60-e70369cc7d58" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a025b9-db61-786a-ad05-e1a01191c838" xlink:to="loc_srt_RangeMember_01a025b9-db61-7ef0-bf60-e70369cc7d58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a025b9-db61-76a8-9d4e-bcf53f551837" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7ef0-bf60-e70369cc7d58" xlink:to="loc_srt_MinimumMember_01a025b9-db61-76a8-9d4e-bcf53f551837" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a025b9-db61-77d8-8656-510c25c44504" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7ef0-bf60-e70369cc7d58" xlink:to="loc_srt_MaximumMember_01a025b9-db61-77d8-8656-510c25c44504" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_01a025b9-db61-7653-a9da-ac07c4a780c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7cb2-b138-7bd2dbc88a27" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_01a025b9-db61-7653-a9da-ac07c4a780c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-7653-a9da-ac07c4a780c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_01a025b9-db61-7653-a9da-ac07c4a780c6" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-7653-a9da-ac07c4a780c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-7064-9643-39622a183b43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_01a025b9-db61-7653-a9da-ac07c4a780c6" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-7064-9643-39622a183b43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_PromissoryNoteMember_01a025b9-db61-7a0f-b8cd-5cb1f19be852" xlink:href="bwmn-20260930.xsd#bwmn_PromissoryNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-7064-9643-39622a183b43" xlink:to="loc_bwmn_PromissoryNoteMember_01a025b9-db61-7a0f-b8cd-5cb1f19be852" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_01a025b9-db61-73d7-a953-b0e24a74b942" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_01a025b9-db61-73d7-a953-b0e24a74b942" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a025b9-db61-77c0-bef6-3cc12c0b90a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a025b9-db61-77c0-bef6-3cc12c0b90a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a025b9-db61-7d96-bc4a-bba834025e82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a025b9-db61-7d96-bc4a-bba834025e82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_01a025b9-db61-7b3f-b466-6f1f283aba93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_01a025b9-db61-7b3f-b466-6f1f283aba93" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableLockUpPeriod_01a025b9-db61-76f1-b7c8-87b86161cd6c" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableLockUpPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_bwmn_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableLockUpPeriod_01a025b9-db61-76f1-b7c8-87b86161cd6c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_DebtInstrumentPeriodicPaymentInterestOnlyNumberOfQuarterlyPayments_01a025b9-db61-7504-ab12-46407e96ad49" xlink:href="bwmn-20260930.xsd#bwmn_DebtInstrumentPeriodicPaymentInterestOnlyNumberOfQuarterlyPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_bwmn_DebtInstrumentPeriodicPaymentInterestOnlyNumberOfQuarterlyPayments_01a025b9-db61-7504-ab12-46407e96ad49" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_DebtInstrumentPeriodicPaymentPrincipalAndInterestNumberOfQuarterlyPayments_01a025b9-db61-7376-a000-985a71874549" xlink:href="bwmn-20260930.xsd#bwmn_DebtInstrumentPeriodicPaymentPrincipalAndInterestNumberOfQuarterlyPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_bwmn_DebtInstrumentPeriodicPaymentPrincipalAndInterestNumberOfQuarterlyPayments_01a025b9-db61-7376-a000-985a71874549" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_NumberOfBusinessesAcquiredIncludingContingentConsideration_01a025b9-db61-7cb8-9c4d-73fb0f17a402" xlink:href="bwmn-20260930.xsd#bwmn_NumberOfBusinessesAcquiredIncludingContingentConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_bwmn_NumberOfBusinessesAcquiredIncludingContingentConsideration_01a025b9-db61-7cb8-9c4d-73fb0f17a402" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_01a025b9-db61-7f6e-b052-f720544e51dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_01a025b9-db61-7f6e-b052-f720544e51dd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_01a025b9-db61-753d-b55a-e7c82f5668ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_01a025b9-db61-753d-b55a-e7c82f5668ea" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_01a025b9-db61-7d46-80ec-eb0dd29cdeda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7941-8a5f-0b0e35558701" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_01a025b9-db61-7d46-80ec-eb0dd29cdeda" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/AcquisitionsSummaryofChangesinCalculationsoftheFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#AcquisitionsSummaryofChangesinCalculationsoftheFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/AcquisitionsSummaryofChangesinCalculationsoftheFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-70e3-8776-62b23c1f1ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7595-9cdd-84b2463abe42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-70e3-8776-62b23c1f1ca5" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7595-9cdd-84b2463abe42" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-79a0-8d50-9453a9d03457" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7595-9cdd-84b2463abe42" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-79a0-8d50-9453a9d03457" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-79a0-8d50-9453a9d03457_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-79a0-8d50-9453a9d03457" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-79a0-8d50-9453a9d03457_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7bca-ad48-cd51e31c444e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-79a0-8d50-9453a9d03457" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7bca-ad48-cd51e31c444e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_RTPAllianceLLCMember_01a025b9-db61-7802-b245-867b573d8636" xlink:href="bwmn-20260930.xsd#bwmn_RTPAllianceLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7bca-ad48-cd51e31c444e" xlink:to="loc_bwmn_RTPAllianceLLCMember_01a025b9-db61-7802-b245-867b573d8636" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-77a1-ae50-6c97e3c45030" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7bca-ad48-cd51e31c444e" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-77a1-ae50-6c97e3c45030" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-70e3-8776-62b23c1f1ca5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_01a025b9-db61-7e93-88a6-bef61aa2ce25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_01a025b9-db61-7e93-88a6-bef61aa2ce25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsContractAssets_01a025b9-db61-75ea-aba4-2f5beee5681f" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsContractAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:to="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsContractAssets_01a025b9-db61-75ea-aba4-2f5beee5681f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_01a025b9-db61-7c48-8335-3b5c24587829" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_01a025b9-db61-7c48-8335-3b5c24587829" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_01a025b9-db61-7f62-b60f-2c9072e18d30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_01a025b9-db61-7f62-b60f-2c9072e18d30" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOperatingLease_01a025b9-db61-787b-b81b-f6c587c8108d" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOperatingLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:to="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOperatingLease_01a025b9-db61-787b-b81b-f6c587c8108d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a025b9-db61-7497-90f3-cac0d86a17a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:to="loc_us-gaap_Goodwill_01a025b9-db61-7497-90f3-cac0d86a17a1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOtherIntangibleAssets_01a025b9-db61-7406-85eb-b626a90e7b8d" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOtherIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:to="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOtherIntangibleAssets_01a025b9-db61-7406-85eb-b626a90e7b8d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_01a025b9-db61-7b3d-a5e9-272405276afe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_01a025b9-db61-7b3d-a5e9-272405276afe" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill_01a025b9-db61-74b5-98d3-50ccf1f8259a" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a025b9-db61-75de-ad28-da35a83c7faf" xlink:to="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill_01a025b9-db61-74b5-98d3-50ccf1f8259a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a025b9-db61-72c6-a386-fa61211e535f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-70e3-8776-62b23c1f1ca5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a025b9-db61-72c6-a386-fa61211e535f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_01a025b9-db61-7cf1-88f1-b7713740e353" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a025b9-db61-72c6-a386-fa61211e535f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_01a025b9-db61-7cf1-88f1-b7713740e353" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesContractLiabilities_01a025b9-db61-7090-b2af-ff42c19b4a4c" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesContractLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a025b9-db61-72c6-a386-fa61211e535f" xlink:to="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesContractLiabilities_01a025b9-db61-7090-b2af-ff42c19b4a4c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_01a025b9-db61-7b4c-916f-321a3f75b44d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a025b9-db61-72c6-a386-fa61211e535f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_01a025b9-db61-7b4c-916f-321a3f75b44d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOperatingLeaseObligation_01a025b9-db61-7fa8-b1a7-f033f9ea6afe" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOperatingLeaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a025b9-db61-72c6-a386-fa61211e535f" xlink:to="loc_bwmn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOperatingLeaseObligation_01a025b9-db61-7fa8-b1a7-f033f9ea6afe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_01a025b9-db61-7898-8738-d75d7a73f37d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a025b9-db61-72c6-a386-fa61211e535f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_01a025b9-db61-7898-8738-d75d7a73f37d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_01a025b9-db61-7d2b-9920-c681c30a13a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-70e3-8776-62b23c1f1ca5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_01a025b9-db61-7d2b-9920-c681c30a13a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombinationAbstract_01a025b9-db61-7b40-828a-d6a2c23d2257" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombinationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-70e3-8776-62b23c1f1ca5" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombinationAbstract_01a025b9-db61-7b40-828a-d6a2c23d2257" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_01a067ac-d1c4-7584-8f9e-d49117ff8b5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombinationAbstract_01a025b9-db61-7b40-828a-d6a2c23d2257" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_01a067ac-d1c4-7584-8f9e-d49117ff8b5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_01a025b9-db61-7503-9bf3-804be775780c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombinationAbstract_01a025b9-db61-7b40-828a-d6a2c23d2257" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_01a025b9-db61-7503-9bf3-804be775780c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/AcquisitionsSummaryofResultsofOperationsofBusinessesAcquiredFromDatesofAcquisitionsDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#AcquisitionsSummaryofResultsofOperationsofBusinessesAcquiredFromDatesofAcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/AcquisitionsSummaryofResultsofOperationsofBusinessesAcquiredFromDatesofAcquisitionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-786b-8007-5397535e61ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7379-81d4-9af65ac5d6c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-786b-8007-5397535e61ec" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7379-81d4-9af65ac5d6c1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7b2f-9bf1-5ed187f1949e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7379-81d4-9af65ac5d6c1" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7b2f-9bf1-5ed187f1949e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7b2f-9bf1-5ed187f1949e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7b2f-9bf1-5ed187f1949e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7b2f-9bf1-5ed187f1949e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7f93-854b-b0db56d578ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7b2f-9bf1-5ed187f1949e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7f93-854b-b0db56d578ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_RTPAllianceLLCMember_01a025b9-db61-70ee-b22f-25c3d0b591fe" xlink:href="bwmn-20260930.xsd#bwmn_RTPAllianceLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7f93-854b-b0db56d578ee" xlink:to="loc_bwmn_RTPAllianceLLCMember_01a025b9-db61-70ee-b22f-25c3d0b591fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-7bf1-9c48-c08f3f289e07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7f93-854b-b0db56d578ee" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-7bf1-9c48-c08f3f289e07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_01a025b9-db61-748c-b59e-60ee348f4e14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-786b-8007-5397535e61ec" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_01a025b9-db61-748c-b59e-60ee348f4e14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_01a025b9-db61-7cbb-ad6c-6490e76a76db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-786b-8007-5397535e61ec" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_01a025b9-db61-7cbb-ad6c-6490e76a76db" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/AcquisitionsSummaryofUnauditedProFormaResultsDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#AcquisitionsSummaryofUnauditedProFormaResultsDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/AcquisitionsSummaryofUnauditedProFormaResultsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7441-bcfa-1373a19bc2d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7d03-8dcd-7a526a633687" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7441-bcfa-1373a19bc2d1" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7d03-8dcd-7a526a633687" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7f2e-98c1-55a56978cd0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-7d03-8dcd-7a526a633687" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7f2e-98c1-55a56978cd0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7f2e-98c1-55a56978cd0f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7f2e-98c1-55a56978cd0f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7f2e-98c1-55a56978cd0f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7872-a8a0-fff873d81f1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7f2e-98c1-55a56978cd0f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7872-a8a0-fff873d81f1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_RTPAllianceLLCMember_01a025b9-db61-72be-9646-d1940d3811d9" xlink:href="bwmn-20260930.xsd#bwmn_RTPAllianceLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7872-a8a0-fff873d81f1a" xlink:to="loc_bwmn_RTPAllianceLLCMember_01a025b9-db61-72be-9646-d1940d3811d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-7cac-93cb-ac2ddba4bc0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7872-a8a0-fff873d81f1a" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-7cac-93cb-ac2ddba4bc0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_01a025b9-db61-732c-bfa9-c70713d01ec9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7441-bcfa-1373a19bc2d1" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_01a025b9-db61-732c-bfa9-c70713d01ec9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationProFormaInformationProFormaIncomeLossBeforeTax_01a025b9-db61-745f-b82d-bbeb8c41777d" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationProFormaInformationProFormaIncomeLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7441-bcfa-1373a19bc2d1" xlink:to="loc_bwmn_BusinessCombinationProFormaInformationProFormaIncomeLossBeforeTax_01a025b9-db61-745f-b82d-bbeb8c41777d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/AcquisitionsSummaryofPurchasePriceAllocationatFairValueforIdentifiableIntangibleAssetsAcquiredDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#AcquisitionsSummaryofPurchasePriceAllocationatFairValueforIdentifiableIntangibleAssetsAcquiredDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/AcquisitionsSummaryofPurchasePriceAllocationatFairValueforIdentifiableIntangibleAssetsAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7703-9b45-f76c79c1db4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-750a-8fa8-9fb0ee805890" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7703-9b45-f76c79c1db4e" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-750a-8fa8-9fb0ee805890" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7d76-b2ea-a1a60828aec4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-750a-8fa8-9fb0ee805890" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7d76-b2ea-a1a60828aec4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7d76-b2ea-a1a60828aec4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7d76-b2ea-a1a60828aec4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7d76-b2ea-a1a60828aec4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7e4c-a0f0-b2d606da430e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7d76-b2ea-a1a60828aec4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7e4c-a0f0-b2d606da430e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-7b75-a093-c3cbcfdab270" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7e4c-a0f0-b2d606da430e" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_01a025b9-db61-7b75-a093-c3cbcfdab270" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7e0b-9f70-fc5443591484" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a025b9-db61-750a-8fa8-9fb0ee805890" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7e0b-9f70-fc5443591484" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7e0b-9f70-fc5443591484_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7e0b-9f70-fc5443591484" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7e0b-9f70-fc5443591484_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7fa0-aa75-cda7e92ab17e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7e0b-9f70-fc5443591484" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7fa0-aa75-cda7e92ab17e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_01a025b9-db61-7270-bd32-93910d041c6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7fa0-aa75-cda7e92ab17e" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_01a025b9-db61-7270-bd32-93910d041c6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerContractsMember_01a025b9-db61-701c-9b3b-ad657d8f3313" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7fa0-aa75-cda7e92ab17e" xlink:to="loc_us-gaap_CustomerContractsMember_01a025b9-db61-701c-9b3b-ad657d8f3313" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_01a025b9-db61-7a55-8349-7397d9738dcc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7fa0-aa75-cda7e92ab17e" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_01a025b9-db61-7a55-8349-7397d9738dcc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffMarketFavorableLeaseMember_01a025b9-db61-7a14-aa52-4feb4b594f89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OffMarketFavorableLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7fa0-aa75-cda7e92ab17e" xlink:to="loc_us-gaap_OffMarketFavorableLeaseMember_01a025b9-db61-7a14-aa52-4feb4b594f89" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a025b9-db61-7fea-865e-c88e35d7ffa4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7703-9b45-f76c79c1db4e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a025b9-db61-7fea-865e-c88e35d7ffa4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_01a025b9-db61-7118-8dfb-33f7e4892041" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a025b9-db61-7703-9b45-f76c79c1db4e" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_01a025b9-db61-7118-8dfb-33f7e4892041" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/DisaggregationofRevenueandContractBalancesAdditionalInformationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#DisaggregationofRevenueandContractBalancesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/DisaggregationofRevenueandContractBalancesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a025b9-db61-7ade-8b10-5db258937240" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a025b9-db61-7ade-8b10-5db258937240" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_01a025b9-db61-7602-bad0-ac15bac3b0d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a025b9-db61-7ade-8b10-5db258937240" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_01a025b9-db61-7602-bad0-ac15bac3b0d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a025b9-db61-73e1-a48e-e80942dc1cdd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a025b9-db61-7ade-8b10-5db258937240" xlink:to="loc_srt_RangeAxis_01a025b9-db61-73e1-a48e-e80942dc1cdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-73e1-a48e-e80942dc1cdd_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a025b9-db61-73e1-a48e-e80942dc1cdd" xlink:to="loc_srt_RangeMember_01a025b9-db61-73e1-a48e-e80942dc1cdd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-7c8c-9c18-4480f3e6a29e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a025b9-db61-73e1-a48e-e80942dc1cdd" xlink:to="loc_srt_RangeMember_01a025b9-db61-7c8c-9c18-4480f3e6a29e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a025b9-db61-789f-9e0a-81b6674207e7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7c8c-9c18-4480f3e6a29e" xlink:to="loc_srt_MinimumMember_01a025b9-db61-789f-9e0a-81b6674207e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a025b9-db61-7c20-aac0-768504997e65" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7c8c-9c18-4480f3e6a29e" xlink:to="loc_srt_MaximumMember_01a025b9-db61-7c20-aac0-768504997e65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-7566-98e4-5d996b52d20f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a025b9-db61-7ade-8b10-5db258937240" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-7566-98e4-5d996b52d20f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-7566-98e4-5d996b52d20f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-7566-98e4-5d996b52d20f" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-7566-98e4-5d996b52d20f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-72cc-921c-c3528efb8e49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-7566-98e4-5d996b52d20f" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-72cc-921c-c3528efb8e49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedPriceContractMember_01a025b9-db61-71da-8d3f-89b797dcbf58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedPriceContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-72cc-921c-c3528efb8e49" xlink:to="loc_us-gaap_FixedPriceContractMember_01a025b9-db61-71da-8d3f-89b797dcbf58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_RevenueFromContractWithCustomerPercentOfRevenues_01a025b9-db61-75c8-abb1-ddf327393d6a" xlink:href="bwmn-20260930.xsd#bwmn_RevenueFromContractWithCustomerPercentOfRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_bwmn_RevenueFromContractWithCustomerPercentOfRevenues_01a025b9-db61-75c8-abb1-ddf327393d6a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_01a025b9-db61-7f7d-9c60-4da2f32a8c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_01a025b9-db61-7f7d-9c60-4da2f32a8c0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_01a025b9-db61-778e-bf48-5c8e56e52523" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_01a025b9-db61-778e-bf48-5c8e56e52523" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_01a025b9-db61-73e3-8bdf-06ea5b373403" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_01a025b9-db61-73e3-8bdf-06ea5b373403" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_01a025b9-db61-75b7-9725-cb1c478ae0a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_01a025b9-db61-75b7-9725-cb1c478ae0a6" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/DisaggregationofRevenueandContractBalancesAdditionalInformationDetails_1" xlink:type="simple" xlink:href="bwmn-20260930.xsd#DisaggregationofRevenueandContractBalancesAdditionalInformationDetails_1"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/DisaggregationofRevenueandContractBalancesAdditionalInformationDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a025b9-db61-7ade-8b10-5db258937240" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a025b9-db61-7ade-8b10-5db258937240" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a025b9-db61-73e1-a48e-e80942dc1cdd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a025b9-db61-7ade-8b10-5db258937240" xlink:to="loc_srt_RangeAxis_01a025b9-db61-73e1-a48e-e80942dc1cdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-73e1-a48e-e80942dc1cdd_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a025b9-db61-73e1-a48e-e80942dc1cdd" xlink:to="loc_srt_RangeMember_01a025b9-db61-73e1-a48e-e80942dc1cdd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-7c8c-9c18-4480f3e6a29e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a025b9-db61-73e1-a48e-e80942dc1cdd" xlink:to="loc_srt_RangeMember_01a025b9-db61-7c8c-9c18-4480f3e6a29e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a025b9-db61-789f-9e0a-81b6674207e7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7c8c-9c18-4480f3e6a29e" xlink:to="loc_srt_MinimumMember_01a025b9-db61-789f-9e0a-81b6674207e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a025b9-db61-7c20-aac0-768504997e65" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7c8c-9c18-4480f3e6a29e" xlink:to="loc_srt_MaximumMember_01a025b9-db61-7c20-aac0-768504997e65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-7566-98e4-5d996b52d20f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a025b9-db61-7ade-8b10-5db258937240" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-7566-98e4-5d996b52d20f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-7566-98e4-5d996b52d20f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-7566-98e4-5d996b52d20f" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-7566-98e4-5d996b52d20f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-72cc-921c-c3528efb8e49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-7566-98e4-5d996b52d20f" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-72cc-921c-c3528efb8e49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedPriceContractMember_01a025b9-db61-71da-8d3f-89b797dcbf58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedPriceContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-72cc-921c-c3528efb8e49" xlink:to="loc_us-gaap_FixedPriceContractMember_01a025b9-db61-71da-8d3f-89b797dcbf58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_RevenueFromContractWithCustomerPercentOfRevenues_01a025b9-db61-75c8-abb1-ddf327393d6a" xlink:href="bwmn-20260930.xsd#bwmn_RevenueFromContractWithCustomerPercentOfRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_bwmn_RevenueFromContractWithCustomerPercentOfRevenues_01a025b9-db61-75c8-abb1-ddf327393d6a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_01a025b9-db61-7f7d-9c60-4da2f32a8c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_01a025b9-db61-7f7d-9c60-4da2f32a8c0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_01a025b9-db61-778e-bf48-5c8e56e52523" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_01a025b9-db61-778e-bf48-5c8e56e52523" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_01a025b9-db61-73e3-8bdf-06ea5b373403" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_01a025b9-db61-73e3-8bdf-06ea5b373403" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_01a025b9-db61-75b7-9725-cb1c478ae0a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a025b9-db61-7d70-b320-3667d56c02ec" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_01a025b9-db61-75b7-9725-cb1c478ae0a6" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/DisaggregationofRevenueandContractBalancesSummaryofDisaggregatedRevenuesbyContractTypeDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#DisaggregationofRevenueandContractBalancesSummaryofDisaggregatedRevenuesbyContractTypeDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/DisaggregationofRevenueandContractBalancesSummaryofDisaggregatedRevenuesbyContractTypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_01a025b9-db61-7308-82ab-9f2726bc401b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_01a025b9-db61-74ba-b188-642ba3ef81d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a025b9-db61-7308-82ab-9f2726bc401b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_01a025b9-db61-74ba-b188-642ba3ef81d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-702b-9ecf-f585ae37a354" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a025b9-db61-74ba-b188-642ba3ef81d1" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-702b-9ecf-f585ae37a354" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-702b-9ecf-f585ae37a354_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-702b-9ecf-f585ae37a354" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-702b-9ecf-f585ae37a354_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-7f58-8ae5-0f41e26f20f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_01a025b9-db61-702b-9ecf-f585ae37a354" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-7f58-8ae5-0f41e26f20f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedPriceContractMember_01a025b9-db61-7a32-9caf-b6fb8bc845e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedPriceContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-7f58-8ae5-0f41e26f20f5" xlink:to="loc_us-gaap_FixedPriceContractMember_01a025b9-db61-7a32-9caf-b6fb8bc845e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeAndMaterialsContractMember_01a025b9-db61-7a6f-a234-81af008b275e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimeAndMaterialsContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_01a025b9-db61-7f58-8ae5-0f41e26f20f5" xlink:to="loc_us-gaap_TimeAndMaterialsContractMember_01a025b9-db61-7a6f-a234-81af008b275e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a025b9-db61-764a-aa27-b01bc2ce6441" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a025b9-db61-7308-82ab-9f2726bc401b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a025b9-db61-764a-aa27-b01bc2ce6441" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_RevenueFromContractWithCustomerPercentOfRevenues_01a025b9-db61-7e7a-8698-4f023968076a" xlink:href="bwmn-20260930.xsd#bwmn_RevenueFromContractWithCustomerPercentOfRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a025b9-db61-7308-82ab-9f2726bc401b" xlink:to="loc_bwmn_RevenueFromContractWithCustomerPercentOfRevenues_01a025b9-db61-7e7a-8698-4f023968076a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/NotesReceivableDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#NotesReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/NotesReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a025b9-db61-736c-907d-97b5eb0f15c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a025b9-db61-7e7a-a220-c1886b2eb5f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a025b9-db61-736c-907d-97b5eb0f15c9" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a025b9-db61-7e7a-a220-c1886b2eb5f4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_01a025b9-db61-7f2b-96e7-2126342df907" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a025b9-db61-7e7a-a220-c1886b2eb5f4" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_01a025b9-db61-7f2b-96e7-2126342df907" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_01a025b9-db61-7f2b-96e7-2126342df907_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_01a025b9-db61-7f2b-96e7-2126342df907" xlink:to="loc_us-gaap_ReceivableTypeDomain_01a025b9-db61-7f2b-96e7-2126342df907_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_01a025b9-db61-7508-b748-dba14ae98576" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_01a025b9-db61-7f2b-96e7-2126342df907" xlink:to="loc_us-gaap_ReceivableTypeDomain_01a025b9-db61-7508-b748-dba14ae98576" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_UnsecuredNotesReceivableMember_01a025b9-db61-7f69-b77a-a657803cb1c8" xlink:href="bwmn-20260930.xsd#bwmn_UnsecuredNotesReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_01a025b9-db61-7508-b748-dba14ae98576" xlink:to="loc_bwmn_UnsecuredNotesReceivableMember_01a025b9-db61-7f69-b77a-a657803cb1c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_UnsecuredNotesReceivableUnrelatedThirdPartyMember_01a025b9-db61-76e2-8b6d-8eb1434541c6" xlink:href="bwmn-20260930.xsd#bwmn_UnsecuredNotesReceivableUnrelatedThirdPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_01a025b9-db61-7508-b748-dba14ae98576" xlink:to="loc_bwmn_UnsecuredNotesReceivableUnrelatedThirdPartyMember_01a025b9-db61-76e2-8b6d-8eb1434541c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a025b9-db61-7ed4-8eba-e8b32c4da6b1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a025b9-db61-7e7a-a220-c1886b2eb5f4" xlink:to="loc_srt_RangeAxis_01a025b9-db61-7ed4-8eba-e8b32c4da6b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-7ed4-8eba-e8b32c4da6b1_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a025b9-db61-7ed4-8eba-e8b32c4da6b1" xlink:to="loc_srt_RangeMember_01a025b9-db61-7ed4-8eba-e8b32c4da6b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-7bc0-9742-0fc434eb9e6c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a025b9-db61-7ed4-8eba-e8b32c4da6b1" xlink:to="loc_srt_RangeMember_01a025b9-db61-7bc0-9742-0fc434eb9e6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a025b9-db61-7f0c-ac7b-9c2b9424d548" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7bc0-9742-0fc434eb9e6c" xlink:to="loc_srt_MinimumMember_01a025b9-db61-7f0c-ac7b-9c2b9424d548" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a025b9-db61-7857-b5cf-b389f235c2f8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7bc0-9742-0fc434eb9e6c" xlink:to="loc_srt_MaximumMember_01a025b9-db61-7857-b5cf-b389f235c2f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate_01a025b9-db61-7d96-8165-c43dd78ff2c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a025b9-db61-736c-907d-97b5eb0f15c9" xlink:to="loc_us-gaap_ReceivableWithImputedInterestEffectiveYieldInterestRate_01a025b9-db61-7d96-8165-c43dd78ff2c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_DueFromOfficersEmployeesAndAffiliates_01a025b9-db61-7f4e-b960-0c813bb2de34" xlink:href="bwmn-20260930.xsd#bwmn_DueFromOfficersEmployeesAndAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a025b9-db61-736c-907d-97b5eb0f15c9" xlink:to="loc_bwmn_DueFromOfficersEmployeesAndAffiliates_01a025b9-db61-7f4e-b960-0c813bb2de34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesAndLoansReceivableNetNoncurrent_01a025b9-db61-71bb-8f65-8855c58bde30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesAndLoansReceivableNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a025b9-db61-736c-907d-97b5eb0f15c9" xlink:to="loc_us-gaap_NotesAndLoansReceivableNetNoncurrent_01a025b9-db61-71bb-8f65-8855c58bde30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_UnsecuredNotesReceivableRelatedParties_01a025b9-db61-7022-a324-25dbdd4de008" xlink:href="bwmn-20260930.xsd#bwmn_UnsecuredNotesReceivableRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a025b9-db61-736c-907d-97b5eb0f15c9" xlink:to="loc_bwmn_UnsecuredNotesReceivableRelatedParties_01a025b9-db61-7022-a324-25dbdd4de008" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrentAbstract_01a025b9-db61-71d7-8f31-96a58a8a02af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a025b9-db61-736c-907d-97b5eb0f15c9" xlink:to="loc_us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrentAbstract_01a025b9-db61-71d7-8f31-96a58a8a02af" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_DueFromOfficersEmployeesAndAffiliatesCurrent_01a025b9-db61-75f8-9ed3-219f6a80b705" xlink:href="bwmn-20260930.xsd#bwmn_DueFromOfficersEmployeesAndAffiliatesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrentAbstract_01a025b9-db61-71d7-8f31-96a58a8a02af" xlink:to="loc_bwmn_DueFromOfficersEmployeesAndAffiliatesCurrent_01a025b9-db61-75f8-9ed3-219f6a80b705" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent_01a025b9-db61-78cf-a11f-9e220dfa1ac6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a025b9-db61-736c-907d-97b5eb0f15c9" xlink:to="loc_us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent_01a025b9-db61-78cf-a11f-9e220dfa1ac6" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/PropertyandEquipmentNetSummaryofPropertyandEquipmentforFixedAssetsDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#PropertyandEquipmentNetSummaryofPropertyandEquipmentforFixedAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/PropertyandEquipmentNetSummaryofPropertyandEquipmentforFixedAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-7c58-ae24-03d6450bf5fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_01a025b9-db61-7c8f-a4c5-40057f0feb43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-7c58-ae24-03d6450bf5fb" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_01a025b9-db61-7c8f-a4c5-40057f0feb43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_01a025b9-db61-7e26-8289-3edbdda7654b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_01a025b9-db61-7c8f-a4c5-40057f0feb43" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_01a025b9-db61-7e26-8289-3edbdda7654b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-7e26-8289-3edbdda7654b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_01a025b9-db61-7e26-8289-3edbdda7654b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-7e26-8289-3edbdda7654b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_01a025b9-db61-7e26-8289-3edbdda7654b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_01a025b9-db61-7bfc-a70d-cbe77f0de47f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_us-gaap_ComputerEquipmentMember_01a025b9-db61-7bfc-a70d-cbe77f0de47f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_SurveyEquipmentMember_01a025b9-db61-7951-a69a-969c27008237" xlink:href="bwmn-20260930.xsd#bwmn_SurveyEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_bwmn_SurveyEquipmentMember_01a025b9-db61-7951-a69a-969c27008237" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VehiclesMember_01a025b9-db61-778a-a93d-4da410ece8ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_us-gaap_VehiclesMember_01a025b9-db61-778a-a93d-4da410ece8ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_01a025b9-db61-7975-a545-297e9affab1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_01a025b9-db61-7975-a545-297e9affab1d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_01a025b9-db61-74d0-b9d6-d325ec658e1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_01a025b9-db61-74d0-b9d6-d325ec658e1c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_01a025b9-db61-7103-a907-a4ff38e26095" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_01a025b9-db61-7103-a907-a4ff38e26095" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_CameraEquipmentMember_01a025b9-db61-755d-8e22-ac2a1efae731" xlink:href="bwmn-20260930.xsd#bwmn_CameraEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_bwmn_CameraEquipmentMember_01a025b9-db61-755d-8e22-ac2a1efae731" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AirTransportationEquipmentMember_01a025b9-db61-7f56-a5df-b99a023fc203" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AirTransportationEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_us-gaap_AirTransportationEquipmentMember_01a025b9-db61-7f56-a5df-b99a023fc203" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_EngineAndGPSMember_01a025b9-db61-7280-8b63-0e44267c9248" xlink:href="bwmn-20260930.xsd#bwmn_EngineAndGPSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_bwmn_EngineAndGPSMember_01a025b9-db61-7280-8b63-0e44267c9248" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_FixedAssetsPendingLeaseFinancingMember_01a025b9-db61-7905-9118-8b2bab8e639e" xlink:href="bwmn-20260930.xsd#bwmn_FixedAssetsPendingLeaseFinancingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-792c-bb77-bc71c96e0c98" xlink:to="loc_bwmn_FixedAssetsPendingLeaseFinancingMember_01a025b9-db61-7905-9118-8b2bab8e639e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_01a025b9-db61-7b87-90e6-46729791145c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-7c58-ae24-03d6450bf5fb" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_01a025b9-db61-7b87-90e6-46729791145c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_01a025b9-db61-790e-9895-57c6e11c3737" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-7c58-ae24-03d6450bf5fb" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_01a025b9-db61-790e-9895-57c6e11c3737" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_01a025b9-db61-72a9-85dd-cba939ad1687" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-7c58-ae24-03d6450bf5fb" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_01a025b9-db61-72a9-85dd-cba939ad1687" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/PropertyandEquipmentNetSummaryofPropertyandEquipmentforCapitalLeasedAssetsDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#PropertyandEquipmentNetSummaryofPropertyandEquipmentforCapitalLeasedAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/PropertyandEquipmentNetSummaryofPropertyandEquipmentforCapitalLeasedAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-72c0-a97f-71ab8f09dd66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_01a025b9-db61-77ec-a621-a74a23f819aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-72c0-a97f-71ab8f09dd66" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_01a025b9-db61-77ec-a621-a74a23f819aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_01a025b9-db61-7076-9889-1255cb079f50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_01a025b9-db61-77ec-a621-a74a23f819aa" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_01a025b9-db61-7076-9889-1255cb079f50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-7076-9889-1255cb079f50_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_01a025b9-db61-7076-9889-1255cb079f50" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-7076-9889-1255cb079f50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-7cb8-ab8e-02b7a8863a50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_01a025b9-db61-7076-9889-1255cb079f50" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-7cb8-ab8e-02b7a8863a50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_01a025b9-db61-7ed4-b61c-b8f3b8635cf2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-7cb8-ab8e-02b7a8863a50" xlink:to="loc_us-gaap_EquipmentMember_01a025b9-db61-7ed4-b61c-b8f3b8635cf2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VehiclesMember_01a025b9-db61-7d74-9111-e997cce20255" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_01a025b9-db61-7cb8-ab8e-02b7a8863a50" xlink:to="loc_us-gaap_VehiclesMember_01a025b9-db61-7d74-9111-e997cce20255" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_01a025b9-db61-76f5-ae56-e1a8a1944dce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-72c0-a97f-71ab8f09dd66" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_01a025b9-db61-76f5-ae56-e1a8a1944dce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_01a025b9-db61-78f4-88e7-f324b1422a89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-72c0-a97f-71ab8f09dd66" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_01a025b9-db61-78f4-88e7-f324b1422a89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_01a025b9-db61-749e-bf76-3c50fca6b938" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_01a025b9-db61-72c0-a97f-71ab8f09dd66" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_01a025b9-db61-749e-bf76-3c50fca6b938" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/GoodwillDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#GoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/GoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_01a025b9-db61-767f-bc43-ea0b9ae04f28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_01a025b9-db61-7156-93c6-0b6c7dccd0fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_01a025b9-db61-767f-bc43-ea0b9ae04f28" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_01a025b9-db61-7156-93c6-0b6c7dccd0fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7714-b3b1-f7a08468f9ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_01a025b9-db61-7156-93c6-0b6c7dccd0fc" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7714-b3b1-f7a08468f9ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7714-b3b1-f7a08468f9ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7714-b3b1-f7a08468f9ff" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-7714-b3b1-f7a08468f9ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-737f-82db-ba8a70a8f540" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-db61-7714-b3b1-f7a08468f9ff" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-737f-82db-ba8a70a8f540" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_A2026AcquisitionsMember_01a025b9-db61-75f7-95d7-354444729c3e" xlink:href="bwmn-20260930.xsd#bwmn_A2026AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-db61-737f-82db-ba8a70a8f540" xlink:to="loc_bwmn_A2026AcquisitionsMember_01a025b9-db61-75f7-95d7-354444729c3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_01a025b9-db61-7b65-810d-5bb3891b277b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_01a025b9-db61-767f-bc43-ea0b9ae04f28" xlink:to="loc_us-gaap_GoodwillRollForward_01a025b9-db61-7b65-810d-5bb3891b277b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a025b9-db61-7aab-94d3-1b025c98f4a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_01a025b9-db61-7b65-810d-5bb3891b277b" xlink:to="loc_us-gaap_Goodwill_01a025b9-db61-7aab-94d3-1b025c98f4a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_01a025b9-db61-781a-8fd8-528d8d18ed8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_01a025b9-db61-7b65-810d-5bb3891b277b" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_01a025b9-db61-781a-8fd8-528d8d18ed8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a025b9-db61-7e52-b66d-310bfdf9f720" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_01a025b9-db61-7c5f-b647-6fc016c9f7a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_01a025b9-db61-767f-bc43-ea0b9ae04f28" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_01a025b9-db61-7c5f-b647-6fc016c9f7a6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/IntangibleAssetsSummaryofTotalIntangibleAssetsDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#IntangibleAssetsSummaryofTotalIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/IntangibleAssetsSummaryofTotalIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-7060-a47b-cc36b7a5aa8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-7b72-b50c-1a55d0756a6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-7060-a47b-cc36b7a5aa8f" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-7b72-b50c-1a55d0756a6e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7d3a-92fb-f22dd0a82cd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-7b72-b50c-1a55d0756a6e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7d3a-92fb-f22dd0a82cd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7d3a-92fb-f22dd0a82cd0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7d3a-92fb-f22dd0a82cd0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7d3a-92fb-f22dd0a82cd0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-74c4-bc53-f7e934e46558" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7d3a-92fb-f22dd0a82cd0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-74c4-bc53-f7e934e46558" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_01a025b9-db61-7466-b123-5c15c8c1738e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-74c4-bc53-f7e934e46558" xlink:to="loc_us-gaap_CustomerRelationshipsMember_01a025b9-db61-7466-b123-5c15c8c1738e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualRightsMember_01a025b9-db61-78fc-9675-6c9dc469ab95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractualRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-74c4-bc53-f7e934e46558" xlink:to="loc_us-gaap_ContractualRightsMember_01a025b9-db61-78fc-9675-6c9dc469ab95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_LeaseholdMember_01a025b9-db61-7f73-8f52-54d85a63a466" xlink:href="bwmn-20260930.xsd#bwmn_LeaseholdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-74c4-bc53-f7e934e46558" xlink:to="loc_bwmn_LeaseholdMember_01a025b9-db61-7f73-8f52-54d85a63a466" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_01a025b9-db61-77d8-8148-6b78689a7947" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-74c4-bc53-f7e934e46558" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_01a025b9-db61-77d8-8148-6b78689a7947" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7bfb-92de-6767ba417c59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-7b72-b50c-1a55d0756a6e" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7bfb-92de-6767ba417c59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7bfb-92de-6767ba417c59_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7bfb-92de-6767ba417c59" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7bfb-92de-6767ba417c59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7a67-bf36-ae70cfee324e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7bfb-92de-6767ba417c59" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7a67-bf36-ae70cfee324e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_DomainNameMember_01a025b9-db61-7dad-858e-28644ecff271" xlink:href="bwmn-20260930.xsd#bwmn_DomainNameMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7a67-bf36-ae70cfee324e" xlink:to="loc_bwmn_DomainNameMember_01a025b9-db61-7dad-858e-28644ecff271" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_LicensingRightsMember_01a025b9-db61-717b-846b-ccb95423470e" xlink:href="bwmn-20260930.xsd#bwmn_LicensingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7a67-bf36-ae70cfee324e" xlink:to="loc_bwmn_LicensingRightsMember_01a025b9-db61-717b-846b-ccb95423470e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_01a025b9-db61-7048-8da9-bd7f755bbe61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-7060-a47b-cc36b7a5aa8f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_01a025b9-db61-7048-8da9-bd7f755bbe61" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_01a025b9-db61-734a-b4dc-0d418623c31a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_01a025b9-db61-7048-8da9-bd7f755bbe61" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_01a025b9-db61-734a-b4dc-0d418623c31a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_01a025b9-db61-77de-833d-e8eb53c99521" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_01a025b9-db61-7048-8da9-bd7f755bbe61" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_01a025b9-db61-77de-833d-e8eb53c99521" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_01a025b9-db61-7be6-bdae-d16b2f12c2b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_01a025b9-db61-7048-8da9-bd7f755bbe61" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_01a025b9-db61-7be6-bdae-d16b2f12c2b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillAbstract_01a025b9-db61-7362-b9f0-4e2332eb76bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-7060-a47b-cc36b7a5aa8f" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillAbstract_01a025b9-db61-7362-b9f0-4e2332eb76bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_01a025b9-db61-7713-9a4f-ec550705ad60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillAbstract_01a025b9-db61-7362-b9f0-4e2332eb76bd" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_01a025b9-db61-7713-9a4f-ec550705ad60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_01a025b9-db61-7715-8098-ea7f05503659" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-7060-a47b-cc36b7a5aa8f" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_01a025b9-db61-7715-8098-ea7f05503659" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_01a025b9-db61-74be-bc0c-635b38aec59d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-7060-a47b-cc36b7a5aa8f" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_01a025b9-db61-74be-bc0c-635b38aec59d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/IntangibleAssetsAdditionalInformationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#IntangibleAssetsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/IntangibleAssetsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-73cd-9fc8-de7e627a6a70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-7b45-ab52-fcde214357cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-73cd-9fc8-de7e627a6a70" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-7b45-ab52-fcde214357cd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7ddf-a569-15b4191e07d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-7b45-ab52-fcde214357cd" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7ddf-a569-15b4191e07d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7ddf-a569-15b4191e07d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7ddf-a569-15b4191e07d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7ddf-a569-15b4191e07d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-70de-b4c0-a78ca681bdcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-7ddf-a569-15b4191e07d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-70de-b4c0-a78ca681bdcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_01a025b9-db61-79f1-aac1-51f0539953e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-70de-b4c0-a78ca681bdcd" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_01a025b9-db61-79f1-aac1-51f0539953e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_01a025b9-db61-7c39-8705-deaa6d8ec615" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-70de-b4c0-a78ca681bdcd" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_01a025b9-db61-7c39-8705-deaa6d8ec615" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_AcquiredDevelopedTechnologyMember_01a025b9-db61-7429-8775-2879bf7c8ddf" xlink:href="bwmn-20260930.xsd#bwmn_AcquiredDevelopedTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-70de-b4c0-a78ca681bdcd" xlink:to="loc_bwmn_AcquiredDevelopedTechnologyMember_01a025b9-db61-7429-8775-2879bf7c8ddf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_01a025b9-db61-7f80-8dd3-277692cc6486" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-73cd-9fc8-de7e627a6a70" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_01a025b9-db61-7f80-8dd3-277692cc6486" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_01a025b9-db61-7035-bf6f-817b9f17c772" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-73cd-9fc8-de7e627a6a70" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_01a025b9-db61-7035-bf6f-817b9f17c772" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_01a025b9-db61-72a2-8663-1f8f2de9f013" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-73cd-9fc8-de7e627a6a70" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_01a025b9-db61-72a2-8663-1f8f2de9f013" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/IntangibleAssetsSummaryofWeightedAverageUsefulLivesofIntangibleAssetsbyAssetClassUsedforStraightlineExpensePurposesDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#IntangibleAssetsSummaryofWeightedAverageUsefulLivesofIntangibleAssetsbyAssetClassUsedforStraightlineExpensePurposesDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/IntangibleAssetsSummaryofWeightedAverageUsefulLivesofIntangibleAssetsbyAssetClassUsedforStraightlineExpensePurposesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-7c00-a923-2b6bcd6d631c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-760a-80db-b77c95119e00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-7c00-a923-2b6bcd6d631c" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-760a-80db-b77c95119e00" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-70fa-8882-9ec25bfd8b18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a025b9-db61-760a-80db-b77c95119e00" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-70fa-8882-9ec25bfd8b18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-70fa-8882-9ec25bfd8b18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-70fa-8882-9ec25bfd8b18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-70fa-8882-9ec25bfd8b18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7b8a-b009-56a64709437c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a025b9-db61-70fa-8882-9ec25bfd8b18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7b8a-b009-56a64709437c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_01a025b9-db61-766f-8b48-852ddaaa3b99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7b8a-b009-56a64709437c" xlink:to="loc_us-gaap_CustomerRelationshipsMember_01a025b9-db61-766f-8b48-852ddaaa3b99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualRightsMember_01a025b9-db61-7aa7-b0fb-4e8b92e25b61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractualRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7b8a-b009-56a64709437c" xlink:to="loc_us-gaap_ContractualRightsMember_01a025b9-db61-7aa7-b0fb-4e8b92e25b61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_LeaseholdMember_01a025b9-db61-7118-8531-d8aa4c26b0bf" xlink:href="bwmn-20260930.xsd#bwmn_LeaseholdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7b8a-b009-56a64709437c" xlink:to="loc_bwmn_LeaseholdMember_01a025b9-db61-7118-8531-d8aa4c26b0bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_DevelopedTechnologyMember_01a025b9-db61-7adb-8600-79e6f038a31d" xlink:href="bwmn-20260930.xsd#bwmn_DevelopedTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a025b9-db61-7b8a-b009-56a64709437c" xlink:to="loc_bwmn_DevelopedTechnologyMember_01a025b9-db61-7adb-8600-79e6f038a31d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_01a025b9-db61-7354-a40c-3c31013d4b14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a025b9-db61-7c00-a923-2b6bcd6d631c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_01a025b9-db61-7354-a40c-3c31013d4b14" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/RevolvingCreditFacilityDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#RevolvingCreditFacilityDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/RevolvingCreditFacilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_01a025b9-db61-7a10-b7de-5f55c8ba7b0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_01a025b9-db61-76de-ae29-d70630f9ff52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a025b9-db61-7a10-b7de-5f55c8ba7b0e" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_01a025b9-db61-76de-ae29-d70630f9ff52" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a025b9-db61-78ed-a0e4-daa7971e21fc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_01a025b9-db61-76de-ae29-d70630f9ff52" xlink:to="loc_srt_RangeAxis_01a025b9-db61-78ed-a0e4-daa7971e21fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-78ed-a0e4-daa7971e21fc_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a025b9-db61-78ed-a0e4-daa7971e21fc" xlink:to="loc_srt_RangeMember_01a025b9-db61-78ed-a0e4-daa7971e21fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-7b49-89f3-136dab9026f5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a025b9-db61-78ed-a0e4-daa7971e21fc" xlink:to="loc_srt_RangeMember_01a025b9-db61-7b49-89f3-136dab9026f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a025b9-db61-78f2-85a5-1434cd84ad01" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7b49-89f3-136dab9026f5" xlink:to="loc_srt_MinimumMember_01a025b9-db61-78f2-85a5-1434cd84ad01" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a025b9-db61-7eb5-ad0d-999bae692a29" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7b49-89f3-136dab9026f5" xlink:to="loc_srt_MaximumMember_01a025b9-db61-7eb5-ad0d-999bae692a29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_01a025b9-db61-7be4-ba4e-c2743f74362e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_01a025b9-db61-76de-ae29-d70630f9ff52" xlink:to="loc_us-gaap_CreditFacilityAxis_01a025b9-db61-7be4-ba4e-c2743f74362e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a025b9-db61-7be4-ba4e-c2743f74362e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_01a025b9-db61-7be4-ba4e-c2743f74362e" xlink:to="loc_us-gaap_CreditFacilityDomain_01a025b9-db61-7be4-ba4e-c2743f74362e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a025b9-db61-74f4-973c-2f510ca3d919" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_01a025b9-db61-7be4-ba4e-c2743f74362e" xlink:to="loc_us-gaap_CreditFacilityDomain_01a025b9-db61-74f4-973c-2f510ca3d919" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_01a025b9-db61-7598-8af6-9be8198fff0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_01a025b9-db61-74f4-973c-2f510ca3d919" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_01a025b9-db61-7598-8af6-9be8198fff0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_AmendedAndRestatedAgreementMember_01a025b9-db61-799c-8e03-3d4b9e395a56" xlink:href="bwmn-20260930.xsd#bwmn_AmendedAndRestatedAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_01a025b9-db61-74f4-973c-2f510ca3d919" xlink:to="loc_bwmn_AmendedAndRestatedAgreementMember_01a025b9-db61-799c-8e03-3d4b9e395a56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_RevolvingCreditFacility2024Member_01a025b9-db61-7aa5-8673-347b0b68fda3" xlink:href="bwmn-20260930.xsd#bwmn_RevolvingCreditFacility2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_01a025b9-db61-74f4-973c-2f510ca3d919" xlink:to="loc_bwmn_RevolvingCreditFacility2024Member_01a025b9-db61-7aa5-8673-347b0b68fda3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_01a025b9-db61-7e76-a59d-72798e883f79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_01a025b9-db61-76de-ae29-d70630f9ff52" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_01a025b9-db61-7e76-a59d-72798e883f79" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_01a025b9-db61-7e76-a59d-72798e883f79_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_01a025b9-db61-7e76-a59d-72798e883f79" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_01a025b9-db61-7e76-a59d-72798e883f79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_01a025b9-db61-77e7-bb16-b04e8764362e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_01a025b9-db61-7e76-a59d-72798e883f79" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_01a025b9-db61-77e7-bb16-b04e8764362e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BankOfAmericaMember_01a025b9-db61-7dc0-8678-8bbd7214c5e3" xlink:href="bwmn-20260930.xsd#bwmn_BankOfAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_01a025b9-db61-77e7-bb16-b04e8764362e" xlink:to="loc_bwmn_BankOfAmericaMember_01a025b9-db61-7dc0-8678-8bbd7214c5e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_01a025b9-db61-759a-a62f-2202d699d685" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a025b9-db61-7a10-b7de-5f55c8ba7b0e" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_01a025b9-db61-759a-a62f-2202d699d685" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_01a025b9-db61-76d0-b1a7-15d3859f6542" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a025b9-db61-7a10-b7de-5f55c8ba7b0e" xlink:to="loc_us-gaap_LineOfCredit_01a025b9-db61-76d0-b1a7-15d3859f6542" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_01a025b9-db61-7557-bbc1-6dc64473e933" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a025b9-db61-7a10-b7de-5f55c8ba7b0e" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_01a025b9-db61-7557-bbc1-6dc64473e933" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityPeriodicPaymentInterest_01a025b9-db61-7e75-983c-dd3b21dbb207" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityPeriodicPaymentInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a025b9-db61-7a10-b7de-5f55c8ba7b0e" xlink:to="loc_us-gaap_LineOfCreditFacilityPeriodicPaymentInterest_01a025b9-db61-7e75-983c-dd3b21dbb207" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/NotesPayableSummaryofNotesPayableDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#NotesPayableSummaryofNotesPayableDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/NotesPayableSummaryofNotesPayableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7473-9df4-41a2e6b98fd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-77e9-9586-f070f67b6ad6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7473-9df4-41a2e6b98fd8" xlink:to="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-77e9-9586-f070f67b6ad6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-73f3-af99-0477466e28a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-77e9-9586-f070f67b6ad6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-73f3-af99-0477466e28a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-73f3-af99-0477466e28a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-73f3-af99-0477466e28a6" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-73f3-af99-0477466e28a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7fa5-bc8f-503b0bc15496" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-73f3-af99-0477466e28a6" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7fa5-bc8f-503b0bc15496" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_NotesPayableMember_01a025b9-db61-7a40-9e9a-c16af45ccc37" xlink:href="bwmn-20260930.xsd#bwmn_NotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7fa5-bc8f-503b0bc15496" xlink:to="loc_bwmn_NotesPayableMember_01a025b9-db61-7a40-9e9a-c16af45ccc37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_InterestRate5.008.50Member_01a025b9-db61-7536-ad23-147b33a328ee" xlink:href="bwmn-20260930.xsd#bwmn_InterestRate5.008.50Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7fa5-bc8f-503b0bc15496" xlink:to="loc_bwmn_InterestRate5.008.50Member_01a025b9-db61-7536-ad23-147b33a328ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_InterestRate5.005.50Member_01a025b9-db61-7922-953b-0c4d2dc86ea8" xlink:href="bwmn-20260930.xsd#bwmn_InterestRate5.005.50Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7fa5-bc8f-503b0bc15496" xlink:to="loc_bwmn_InterestRate5.005.50Member_01a025b9-db61-7922-953b-0c4d2dc86ea8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_NotesPayableToUnrelatedThirdPartiesMember_01a025b9-db61-7766-a94a-af5a3750eb1b" xlink:href="bwmn-20260930.xsd#bwmn_NotesPayableToUnrelatedThirdPartiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7fa5-bc8f-503b0bc15496" xlink:to="loc_bwmn_NotesPayableToUnrelatedThirdPartiesMember_01a025b9-db61-7766-a94a-af5a3750eb1b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_NotesPayableToRelatedPartiesMember_01a025b9-db61-7157-bc0d-59e1877cfaf9" xlink:href="bwmn-20260930.xsd#bwmn_NotesPayableToRelatedPartiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7fa5-bc8f-503b0bc15496" xlink:to="loc_bwmn_NotesPayableToRelatedPartiesMember_01a025b9-db61-7157-bc0d-59e1877cfaf9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7c50-900c-e41a301f852d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-77e9-9586-f070f67b6ad6" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7c50-900c-e41a301f852d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7c50-900c-e41a301f852d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7c50-900c-e41a301f852d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7c50-900c-e41a301f852d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-78f4-8efc-8439d7745800" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7c50-900c-e41a301f852d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-78f4-8efc-8439d7745800" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ShareholdersAndOwnersOfAcquiredEntityMember_01a025b9-db61-714e-ac16-2a563c4319a9" xlink:href="bwmn-20260930.xsd#bwmn_ShareholdersAndOwnersOfAcquiredEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-78f4-8efc-8439d7745800" xlink:to="loc_bwmn_ShareholdersAndOwnersOfAcquiredEntityMember_01a025b9-db61-714e-ac16-2a563c4319a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_PurchaseOfAircraftMember_01a025b9-db61-70db-92d8-58f20c32bbf4" xlink:href="bwmn-20260930.xsd#bwmn_PurchaseOfAircraftMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-78f4-8efc-8439d7745800" xlink:to="loc_bwmn_PurchaseOfAircraftMember_01a025b9-db61-70db-92d8-58f20c32bbf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_PurchaseOfIntangibleAssetMember_01a025b9-db61-72ce-868f-3209533c2e88" xlink:href="bwmn-20260930.xsd#bwmn_PurchaseOfIntangibleAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-78f4-8efc-8439d7745800" xlink:to="loc_bwmn_PurchaseOfIntangibleAssetMember_01a025b9-db61-72ce-868f-3209533c2e88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_OtherMember_01a025b9-db61-7803-99b3-0a9ca036223a" xlink:href="bwmn-20260930.xsd#bwmn_OtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-78f4-8efc-8439d7745800" xlink:to="loc_bwmn_OtherMember_01a025b9-db61-7803-99b3-0a9ca036223a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_01a025b9-db61-794b-bd08-eade4c21bd6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-77e9-9586-f070f67b6ad6" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_01a025b9-db61-794b-bd08-eade4c21bd6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-794b-bd08-eade4c21bd6e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_01a025b9-db61-794b-bd08-eade4c21bd6e" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-794b-bd08-eade4c21bd6e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-7011-b767-ed672d0ae7eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_01a025b9-db61-794b-bd08-eade4c21bd6e" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-7011-b767-ed672d0ae7eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleNotesPayableMember_01a025b9-db61-7b65-a6f8-2236852d0f07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleNotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_01a025b9-db61-7011-b767-ed672d0ae7eb" xlink:to="loc_us-gaap_ConvertibleNotesPayableMember_01a025b9-db61-7b65-a6f8-2236852d0f07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a025b9-db61-78d5-84be-1ccd4c3cb2cb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-77e9-9586-f070f67b6ad6" xlink:to="loc_srt_RangeAxis_01a025b9-db61-78d5-84be-1ccd4c3cb2cb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-78d5-84be-1ccd4c3cb2cb_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a025b9-db61-78d5-84be-1ccd4c3cb2cb" xlink:to="loc_srt_RangeMember_01a025b9-db61-78d5-84be-1ccd4c3cb2cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-7e1a-a5e8-3d655586a1b8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a025b9-db61-78d5-84be-1ccd4c3cb2cb" xlink:to="loc_srt_RangeMember_01a025b9-db61-7e1a-a5e8-3d655586a1b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a025b9-db61-706c-9f6d-b27362f6dc1b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7e1a-a5e8-3d655586a1b8" xlink:to="loc_srt_MinimumMember_01a025b9-db61-706c-9f6d-b27362f6dc1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a025b9-db61-7cf6-a415-6c5ff2a1de24" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-7e1a-a5e8-3d655586a1b8" xlink:to="loc_srt_MaximumMember_01a025b9-db61-7cf6-a415-6c5ff2a1de24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a025b9-db61-79ec-8a31-aeb0ee5caf0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-77e9-9586-f070f67b6ad6" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a025b9-db61-79ec-8a31-aeb0ee5caf0e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-79ec-8a31-aeb0ee5caf0e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a025b9-db61-79ec-8a31-aeb0ee5caf0e" xlink:to="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-79ec-8a31-aeb0ee5caf0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7dad-820b-40b030867131" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a025b9-db61-79ec-8a31-aeb0ee5caf0e" xlink:to="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7dad-820b-40b030867131" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_01a025b9-db61-7492-8fe9-077bc5c29e5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7dad-820b-40b030867131" xlink:to="loc_us-gaap_RelatedPartyMember_01a025b9-db61-7492-8fe9-077bc5c29e5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_01a025b9-db61-7544-a6e3-df4af962ff3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7dad-820b-40b030867131" xlink:to="loc_us-gaap_NonrelatedPartyMember_01a025b9-db61-7544-a6e3-df4af962ff3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_01a025b9-db61-765f-accd-37ab2f19ed91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7473-9df4-41a2e6b98fd8" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_01a025b9-db61-765f-accd-37ab2f19ed91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayable_01a025b9-db61-76ad-962e-65b91cc6e310" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7473-9df4-41a2e6b98fd8" xlink:to="loc_us-gaap_NotesPayable_01a025b9-db61-76ad-962e-65b91cc6e310" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_01a025b9-db61-7824-933c-d54bf84bed32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7473-9df4-41a2e6b98fd8" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_01a025b9-db61-7824-933c-d54bf84bed32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableCurrent_01a025b9-db61-7947-a8af-da38590d1c50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7473-9df4-41a2e6b98fd8" xlink:to="loc_us-gaap_NotesPayableCurrent_01a025b9-db61-7947-a8af-da38590d1c50" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermNotesPayable_01a025b9-db61-7fe3-b21f-4671f98f5f6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7473-9df4-41a2e6b98fd8" xlink:to="loc_us-gaap_LongTermNotesPayable_01a025b9-db61-7fe3-b21f-4671f98f5f6b" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/NotesPayableAdditionalInformationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#NotesPayableAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/NotesPayableAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7b9e-a61d-e64acff0f2e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-76f5-9175-61aa3380d70b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7b9e-a61d-e64acff0f2e2" xlink:to="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-76f5-9175-61aa3380d70b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-7f71-adc6-f3b65ad3e247" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-76f5-9175-61aa3380d70b" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-7f71-adc6-f3b65ad3e247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7f71-adc6-f3b65ad3e247_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-7f71-adc6-f3b65ad3e247" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7f71-adc6-f3b65ad3e247_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7aeb-b160-2687dd1c6b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-7f71-adc6-f3b65ad3e247" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7aeb-b160-2687dd1c6b8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_NotesPayableMember_01a025b9-db61-71b4-b43d-7d9fe2f1ddf1" xlink:href="bwmn-20260930.xsd#bwmn_NotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7aeb-b160-2687dd1c6b8c" xlink:to="loc_bwmn_NotesPayableMember_01a025b9-db61-71b4-b43d-7d9fe2f1ddf1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleNotesPayableMember_01a025b9-db61-7e4c-87f3-d772c9f7d8ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleNotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7aeb-b160-2687dd1c6b8c" xlink:to="loc_us-gaap_ConvertibleNotesPayableMember_01a025b9-db61-7e4c-87f3-d772c9f7d8ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7851-b2ca-7329a8820d06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-76f5-9175-61aa3380d70b" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7851-b2ca-7329a8820d06" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7851-b2ca-7329a8820d06_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7851-b2ca-7329a8820d06" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7851-b2ca-7329a8820d06_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7331-be4a-8ccaba2930c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7851-b2ca-7329a8820d06" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7331-be4a-8ccaba2930c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ExeltechConsultingInc.Member_01a025b9-db61-73b1-8593-0d21bd8902ec" xlink:href="bwmn-20260930.xsd#bwmn_ExeltechConsultingInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7331-be4a-8ccaba2930c4" xlink:to="loc_bwmn_ExeltechConsultingInc.Member_01a025b9-db61-73b1-8593-0d21bd8902ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_AnchorConsultantsLLCMember_01a1765c-e575-7884-b60a-737e27a64623" xlink:href="bwmn-20260930.xsd#bwmn_AnchorConsultantsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7331-be4a-8ccaba2930c4" xlink:to="loc_bwmn_AnchorConsultantsLLCMember_01a1765c-e575-7884-b60a-737e27a64623" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_UPEngineeringLLCMember_01a1765e-3592-7f66-b336-2577ffa5ec34" xlink:href="bwmn-20260930.xsd#bwmn_UPEngineeringLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7331-be4a-8ccaba2930c4" xlink:to="loc_bwmn_UPEngineeringLLCMember_01a1765e-3592-7f66-b336-2577ffa5ec34" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_E3iEngineers.INCMember_01a1765e-948a-7cc3-8d84-dcd932422dcb" xlink:href="bwmn-20260930.xsd#bwmn_E3iEngineers.INCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7331-be4a-8ccaba2930c4" xlink:to="loc_bwmn_E3iEngineers.INCMember_01a1765e-948a-7cc3-8d84-dcd932422dcb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_01a1a735-03f4-7d23-b0dc-ee257a3c5113" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a025b9-db61-76f5-9175-61aa3380d70b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_01a1a735-03f4-7d23-b0dc-ee257a3c5113" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a1a735-03f4-7d23-b0dc-ee257a3c5113_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a1a735-03f4-7d23-b0dc-ee257a3c5113" xlink:to="loc_us-gaap_EquityComponentDomain_01a1a735-03f4-7d23-b0dc-ee257a3c5113_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a1a735-03f4-7c24-89b8-4368072fb56a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a1a735-03f4-7d23-b0dc-ee257a3c5113" xlink:to="loc_us-gaap_EquityComponentDomain_01a1a735-03f4-7c24-89b8-4368072fb56a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a1a735-4681-7664-ae8c-b264bc47efc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a1a735-03f4-7c24-89b8-4368072fb56a" xlink:to="loc_us-gaap_CommonStockMember_01a1a735-4681-7664-ae8c-b264bc47efc6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_01a025b9-db61-73df-bad1-580e165d708d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7b9e-a61d-e64acff0f2e2" xlink:to="loc_us-gaap_InterestExpenseDebt_01a025b9-db61-73df-bad1-580e165d708d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_DebtInstrumentConvertibleConvertedAmount_01a025b9-db61-7e84-9cba-a68fb35552ac" xlink:href="bwmn-20260930.xsd#bwmn_DebtInstrumentConvertibleConvertedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7b9e-a61d-e64acff0f2e2" xlink:to="loc_bwmn_DebtInstrumentConvertibleConvertedAmount_01a025b9-db61-7e84-9cba-a68fb35552ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_CommonStockSharesConvertedFromNotesPayable_01a025b9-db61-7b21-af66-536bcccc1fa5" xlink:href="bwmn-20260930.xsd#bwmn_CommonStockSharesConvertedFromNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7b9e-a61d-e64acff0f2e2" xlink:to="loc_bwmn_CommonStockSharesConvertedFromNotesPayable_01a025b9-db61-7b21-af66-536bcccc1fa5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_01a025b9-db61-767c-9dd4-4d8bc15cf0a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7b9e-a61d-e64acff0f2e2" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_01a025b9-db61-767c-9dd4-4d8bc15cf0a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_01a1a734-2db9-779a-ab47-7ce850a8c9b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7b9e-a61d-e64acff0f2e2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_01a1a734-2db9-779a-ab47-7ce850a8c9b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_01a1a736-e244-736b-9491-49e36cb02b35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7b9e-a61d-e64acff0f2e2" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_01a1a736-e244-736b-9491-49e36cb02b35" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_01a025b9-db61-7e79-becd-a759578d4a08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a025b9-db61-7b9e-a61d-e64acff0f2e2" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_01a025b9-db61-7e79-becd-a759578d4a08" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/NotesPayableSummaryofConvertibleNotesDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#NotesPayableSummaryofConvertibleNotesDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/NotesPayableSummaryofConvertibleNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtLineItems_01a025b9-db61-75bb-8865-2b9566974770" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShortTermDebtTable_01a025b9-db61-73aa-a7c1-d09a3a87905a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShortTermDebtTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShortTermDebtLineItems_01a025b9-db61-75bb-8865-2b9566974770" xlink:to="loc_us-gaap_ScheduleOfShortTermDebtTable_01a025b9-db61-73aa-a7c1-d09a3a87905a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-747d-8ba0-9dcad2d93288" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_01a025b9-db61-73aa-a7c1-d09a3a87905a" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-747d-8ba0-9dcad2d93288" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-747d-8ba0-9dcad2d93288_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-747d-8ba0-9dcad2d93288" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-747d-8ba0-9dcad2d93288_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7cd3-9fce-8cb0e2af5bf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a025b9-db61-747d-8ba0-9dcad2d93288" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7cd3-9fce-8cb0e2af5bf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleNotesPayableMember_01a025b9-db61-7c3f-914e-e071a2edd843" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleNotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a025b9-db61-7cd3-9fce-8cb0e2af5bf6" xlink:to="loc_us-gaap_ConvertibleNotesPayableMember_01a025b9-db61-7c3f-914e-e071a2edd843" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7395-a2dc-45029eaf628a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_01a025b9-db61-73aa-a7c1-d09a3a87905a" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7395-a2dc-45029eaf628a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7395-a2dc-45029eaf628a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7395-a2dc-45029eaf628a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-7395-a2dc-45029eaf628a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-796b-baee-20fec5e1f7f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a025b9-db61-7395-a2dc-45029eaf628a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-796b-baee-20fec5e1f7f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_AnchorConsultantsLLCMember_01a025b9-db61-78af-bc86-153d76067d0a" xlink:href="bwmn-20260930.xsd#bwmn_AnchorConsultantsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-796b-baee-20fec5e1f7f5" xlink:to="loc_bwmn_AnchorConsultantsLLCMember_01a025b9-db61-78af-bc86-153d76067d0a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ExeltechConsultingInc.Member_01a025b9-db61-76cb-bcdd-4a7a00ba5c91" xlink:href="bwmn-20260930.xsd#bwmn_ExeltechConsultingInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-796b-baee-20fec5e1f7f5" xlink:to="loc_bwmn_ExeltechConsultingInc.Member_01a025b9-db61-76cb-bcdd-4a7a00ba5c91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_UPEngineeringLLCMember_01a025b9-db61-7202-8f02-75397b658d3f" xlink:href="bwmn-20260930.xsd#bwmn_UPEngineeringLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-796b-baee-20fec5e1f7f5" xlink:to="loc_bwmn_UPEngineeringLLCMember_01a025b9-db61-7202-8f02-75397b658d3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_E3iEngineers.INCMember_01a025b9-db61-7800-a701-046ba94a3d78" xlink:href="bwmn-20260930.xsd#bwmn_E3iEngineers.INCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a025b9-db61-796b-baee-20fec5e1f7f5" xlink:to="loc_bwmn_E3iEngineers.INCMember_01a025b9-db61-7800-a701-046ba94a3d78" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_01a025b9-db61-79ac-a539-4f39ed13bb40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_01a025b9-db61-75bb-8865-2b9566974770" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_01a025b9-db61-79ac-a539-4f39ed13bb40" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a025b9-db61-7d6c-8b9a-7496575d4560" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_01a025b9-db61-75bb-8865-2b9566974770" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a025b9-db61-7d6c-8b9a-7496575d4560" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_01a025b9-db61-7616-ae0b-11054aebb11b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_01a025b9-db61-75bb-8865-2b9566974770" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_01a025b9-db61-7616-ae0b-11054aebb11b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleNotesPayable_01a025b9-db61-7805-9fd8-a9a7594f63a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_01a025b9-db61-75bb-8865-2b9566974770" xlink:to="loc_us-gaap_ConvertibleNotesPayable_01a025b9-db61-7805-9fd8-a9a7594f63a0" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_01a025b9-db61-7942-97ce-aab4b5a5a4fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a025b9-db61-765e-a5ab-89a16a930266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a025b9-db61-7942-97ce-aab4b5a5a4fe" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a025b9-db61-765e-a5ab-89a16a930266" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_01a025b9-db61-7cd6-ac38-fd5422227e61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a025b9-db61-765e-a5ab-89a16a930266" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_01a025b9-db61-7cd6-ac38-fd5422227e61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_01a025b9-db61-7cd6-ac38-fd5422227e61_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_01a025b9-db61-7cd6-ac38-fd5422227e61" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_01a025b9-db61-7cd6-ac38-fd5422227e61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_01a025b9-db61-7f84-9f15-d442d662b2b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_01a025b9-db61-7cd6-ac38-fd5422227e61" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_01a025b9-db61-7f84-9f15-d442d662b2b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BowmanLansdowneDevelopmentLLCMember_01a025b9-db61-7b14-9a0f-56eb2cc8a4b2" xlink:href="bwmn-20260930.xsd#bwmn_BowmanLansdowneDevelopmentLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_01a025b9-db61-7f84-9f15-d442d662b2b1" xlink:to="loc_bwmn_BowmanLansdowneDevelopmentLLCMember_01a025b9-db61-7b14-9a0f-56eb2cc8a4b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_LansdowneDevelopmentGroupLLCMember_01a025b9-db61-708a-b2ff-049d2a7e8ad8" xlink:href="bwmn-20260930.xsd#bwmn_LansdowneDevelopmentGroupLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_01a025b9-db61-7f84-9f15-d442d662b2b1" xlink:to="loc_bwmn_LansdowneDevelopmentGroupLLCMember_01a025b9-db61-708a-b2ff-049d2a7e8ad8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BowmanRealtyInvestments2010LLCMember_01a025b9-db61-7501-8b42-dfd8b2860a04" xlink:href="bwmn-20260930.xsd#bwmn_BowmanRealtyInvestments2010LLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_01a025b9-db61-7f84-9f15-d442d662b2b1" xlink:to="loc_bwmn_BowmanRealtyInvestments2010LLCMember_01a025b9-db61-7501-8b42-dfd8b2860a04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_MRECShenandoahVALLCMember_01a025b9-db61-7f2f-b563-3f2a3ffcd7f1" xlink:href="bwmn-20260930.xsd#bwmn_MRECShenandoahVALLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_01a025b9-db61-7f84-9f15-d442d662b2b1" xlink:to="loc_bwmn_MRECShenandoahVALLCMember_01a025b9-db61-7f2f-b563-3f2a3ffcd7f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_AdministrativeAccountingAndProjectManagementServicesMember_01a025b9-db61-73f4-81d3-dca18dff0634" xlink:href="bwmn-20260930.xsd#bwmn_AdministrativeAccountingAndProjectManagementServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_01a025b9-db61-7f84-9f15-d442d662b2b1" xlink:to="loc_bwmn_AdministrativeAccountingAndProjectManagementServicesMember_01a025b9-db61-73f4-81d3-dca18dff0634" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a025b9-db61-7e36-8ff8-ceb456c95828" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a025b9-db61-765e-a5ab-89a16a930266" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a025b9-db61-7e36-8ff8-ceb456c95828" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7e36-8ff8-ceb456c95828_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a025b9-db61-7e36-8ff8-ceb456c95828" xlink:to="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7e36-8ff8-ceb456c95828_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7b8e-b4f4-732631db88ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a025b9-db61-7e36-8ff8-ceb456c95828" xlink:to="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7b8e-b4f4-732631db88ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ChiefExecutiveOfficerMember_01a025b9-db61-78ac-b1dd-79f10cb19a17" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ChiefExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7b8e-b4f4-732631db88ed" xlink:to="loc_srt_ChiefExecutiveOfficerMember_01a025b9-db61-78ac-b1dd-79f10cb19a17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_01a025b9-db61-7889-a007-ee53d3492847" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_01a025b9-db61-7b8e-b4f4-732631db88ed" xlink:to="loc_us-gaap_RelatedPartyMember_01a025b9-db61-7889-a007-ee53d3492847" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_01a025b9-db61-7a98-ba07-3a775d3d1252" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a025b9-db61-765e-a5ab-89a16a930266" xlink:to="loc_srt_OwnershipAxis_01a025b9-db61-7a98-ba07-3a775d3d1252" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_01a025b9-db61-7a98-ba07-3a775d3d1252_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_01a025b9-db61-7a98-ba07-3a775d3d1252" xlink:to="loc_srt_OwnershipDomain_01a025b9-db61-7a98-ba07-3a775d3d1252_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_01a025b9-db61-7973-8dd4-8379cd7b9833" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_01a025b9-db61-7a98-ba07-3a775d3d1252" xlink:to="loc_srt_OwnershipDomain_01a025b9-db61-7973-8dd4-8379cd7b9833" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_LakeFrederickHoldingsLLCMember_01a025b9-db61-7cff-8f8b-b8bc28670c23" xlink:href="bwmn-20260930.xsd#bwmn_LakeFrederickHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_01a025b9-db61-7973-8dd4-8379cd7b9833" xlink:to="loc_bwmn_LakeFrederickHoldingsLLCMember_01a025b9-db61-7cff-8f8b-b8bc28670c23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BowmanLansdowneDevelopmentLLCAndBowmanRealtyInvestments2013LLCMember_01a025b9-db61-79d2-b57d-8d9f19110fd9" xlink:href="bwmn-20260930.xsd#bwmn_BowmanLansdowneDevelopmentLLCAndBowmanRealtyInvestments2013LLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_01a025b9-db61-7973-8dd4-8379cd7b9833" xlink:to="loc_bwmn_BowmanLansdowneDevelopmentLLCAndBowmanRealtyInvestments2013LLCMember_01a025b9-db61-79d2-b57d-8d9f19110fd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_MrBowmanMember_01a025b9-db61-7c01-ae2d-06d403f82158" xlink:href="bwmn-20260930.xsd#bwmn_MrBowmanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_01a025b9-db61-7973-8dd4-8379cd7b9833" xlink:to="loc_bwmn_MrBowmanMember_01a025b9-db61-7c01-ae2d-06d403f82158" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableNetCurrent_01a025b9-db61-7d8f-bc01-afa6686545b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a025b9-db61-7942-97ce-aab4b5a5a4fe" xlink:to="loc_us-gaap_AccountsNotesAndLoansReceivableNetCurrent_01a025b9-db61-7d8f-bc01-afa6686545b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_01a025b9-db61-7a40-9bb6-779f262cd70a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a025b9-db61-7942-97ce-aab4b5a5a4fe" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_01a025b9-db61-7a40-9bb6-779f262cd70a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDueFromRelatedParties_01a025b9-db61-7056-b78c-f1ef8cff8cd2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDueFromRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a025b9-db61-7942-97ce-aab4b5a5a4fe" xlink:to="loc_us-gaap_IncreaseDecreaseInDueFromRelatedParties_01a025b9-db61-7056-b78c-f1ef8cff8cd2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncome_01a025b9-db61-78a9-a457-25ba449f3704" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a025b9-db61-7942-97ce-aab4b5a5a4fe" xlink:to="loc_us-gaap_OtherOperatingIncome_01a025b9-db61-78a9-a457-25ba449f3704" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_01a025b9-db61-7a7a-81a8-c50b1ac181af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a025b9-db61-7942-97ce-aab4b5a5a4fe" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_01a025b9-db61-7a7a-81a8-c50b1ac181af" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivables_01a025b9-db61-7ce1-9ad4-9cb439cd03c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a025b9-db61-7942-97ce-aab4b5a5a4fe" xlink:to="loc_us-gaap_OtherReceivables_01a025b9-db61-7ce1-9ad4-9cb439cd03c2" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/EmployeeStockPurchaseandStockIncentivePlansAdditionalInformationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#EmployeeStockPurchaseandStockIncentivePlansAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/EmployeeStockPurchaseandStockIncentivePlansAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-7339-92b9-0a0640aa8303" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-7339-92b9-0a0640aa8303" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_01a025b9-db61-79e2-922d-10f4c8066487" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-7339-92b9-0a0640aa8303" xlink:to="loc_us-gaap_PlanNameAxis_01a025b9-db61-79e2-922d-10f4c8066487" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_01a025b9-db61-79e2-922d-10f4c8066487_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_01a025b9-db61-79e2-922d-10f4c8066487" xlink:to="loc_us-gaap_PlanNameDomain_01a025b9-db61-79e2-922d-10f4c8066487_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_01a025b9-db61-7d0c-8861-636c06191a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_01a025b9-db61-79e2-922d-10f4c8066487" xlink:to="loc_us-gaap_PlanNameDomain_01a025b9-db61-7d0c-8861-636c06191a2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_TwoThousandTwentyOneEmployeeStockPurchasePlanMember_01a025b9-db61-72c2-8d85-b0ea5c9cc691" xlink:href="bwmn-20260930.xsd#bwmn_TwoThousandTwentyOneEmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_01a025b9-db61-7d0c-8861-636c06191a2a" xlink:to="loc_bwmn_TwoThousandTwentyOneEmployeeStockPurchasePlanMember_01a025b9-db61-72c2-8d85-b0ea5c9cc691" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BowmanConsultingGroupLtdTwentyTwentyOneOmnibusEquityIncentivePlanMember_01a025b9-db61-7532-a8c3-5c68d0189604" xlink:href="bwmn-20260930.xsd#bwmn_BowmanConsultingGroupLtdTwentyTwentyOneOmnibusEquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_01a025b9-db61-7d0c-8861-636c06191a2a" xlink:to="loc_bwmn_BowmanConsultingGroupLtdTwentyTwentyOneOmnibusEquityIncentivePlanMember_01a025b9-db61-7532-a8c3-5c68d0189604" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BowmanConsultingGroupLtdStockBonusPlanMember_01a025b9-db61-7255-968e-6cead716c2db" xlink:href="bwmn-20260930.xsd#bwmn_BowmanConsultingGroupLtdStockBonusPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_01a025b9-db61-7d0c-8861-636c06191a2a" xlink:to="loc_bwmn_BowmanConsultingGroupLtdStockBonusPlanMember_01a025b9-db61-7255-968e-6cead716c2db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_TwentyTwentyOneExecutiveOfficersLongTermIncentivePlanMember_01a025b9-db61-73b5-9962-725302e3b298" xlink:href="bwmn-20260930.xsd#bwmn_TwentyTwentyOneExecutiveOfficersLongTermIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_01a025b9-db61-7d0c-8861-636c06191a2a" xlink:to="loc_bwmn_TwentyTwentyOneExecutiveOfficersLongTermIncentivePlanMember_01a025b9-db61-73b5-9962-725302e3b298" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a025b9-db61-778b-9c8a-1f5445de0e6c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-7339-92b9-0a0640aa8303" xlink:to="loc_srt_RangeAxis_01a025b9-db61-778b-9c8a-1f5445de0e6c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-778b-9c8a-1f5445de0e6c_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a025b9-db61-778b-9c8a-1f5445de0e6c" xlink:to="loc_srt_RangeMember_01a025b9-db61-778b-9c8a-1f5445de0e6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-db61-71f9-9c22-39acca912550" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a025b9-db61-778b-9c8a-1f5445de0e6c" xlink:to="loc_srt_RangeMember_01a025b9-db61-71f9-9c22-39acca912550" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a025b9-db61-72cf-8220-cab923a18736" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-71f9-9c22-39acca912550" xlink:to="loc_srt_MinimumMember_01a025b9-db61-72cf-8220-cab923a18736" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a025b9-db61-75a1-ab2c-c60e2367edbc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-db61-71f9-9c22-39acca912550" xlink:to="loc_srt_MaximumMember_01a025b9-db61-75a1-ab2c-c60e2367edbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_01a025b9-db61-7210-be4e-3fc3bc20d55b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-7339-92b9-0a0640aa8303" xlink:to="loc_us-gaap_AwardTypeAxis_01a025b9-db61-7210-be4e-3fc3bc20d55b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-7210-be4e-3fc3bc20d55b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_01a025b9-db61-7210-be4e-3fc3bc20d55b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-7210-be4e-3fc3bc20d55b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-7c2e-bd11-50e8e8f707f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_01a025b9-db61-7210-be4e-3fc3bc20d55b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-7c2e-bd11-50e8e8f707f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_01a025b9-db61-7acd-9bd5-bbd0308d05f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-7c2e-bd11-50e8e8f707f2" xlink:to="loc_us-gaap_RestrictedStockMember_01a025b9-db61-7acd-9bd5-bbd0308d05f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_01a025b9-db61-77e2-928c-31ee549a2902" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-7c2e-bd11-50e8e8f707f2" xlink:to="loc_us-gaap_PerformanceSharesMember_01a025b9-db61-77e2-928c-31ee549a2902" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_01a025b9-db61-7a38-960d-a4bf8a6552e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_01a025b9-db61-7a38-960d-a4bf8a6552e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceOfCommonStockPeriodPriorToLastDayOfOfferingPeriod_01a025b9-db61-7c7d-9584-644ccac020fb" xlink:href="bwmn-20260930.xsd#bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceOfCommonStockPeriodPriorToLastDayOfOfferingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceOfCommonStockPeriodPriorToLastDayOfOfferingPeriod_01a025b9-db61-7c7d-9584-644ccac020fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_01a025b9-db61-7838-92ae-8ae1f7a233ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_01a025b9-db61-7838-92ae-8ae1f7a233ad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_01a025b9-db61-7539-8da6-cf9be379dd75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_01a025b9-db61-7539-8da6-cf9be379dd75" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_01a025b9-db61-7f20-8e6d-6043dcb4a2fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_01a025b9-db61-7f20-8e6d-6043dcb4a2fc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_01a025b9-db61-7c48-9183-be31002d8f69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_01a025b9-db61-7c48-9183-be31002d8f69" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_01a025b9-db61-73fa-9bcb-098a8a78e48c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_01a025b9-db61-73fa-9bcb-098a8a78e48c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_PercentageOfCommonStockReserveAutomaticallyIncreases_01a025b9-db61-7593-8113-bb7ad49d1658" xlink:href="bwmn-20260930.xsd#bwmn_PercentageOfCommonStockReserveAutomaticallyIncreases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_bwmn_PercentageOfCommonStockReserveAutomaticallyIncreases_01a025b9-db61-7593-8113-bb7ad49d1658" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_01a025b9-db61-7b61-b889-dc3d4aeb5965" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_01a025b9-db61-7b61-b889-dc3d4aeb5965" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_01a025b9-db61-7975-b239-5609b9df85aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-7072-908b-710d45756ceb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_01a025b9-db61-7975-b239-5609b9df85aa" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/EmployeeStockPurchaseandStockIncentivePlansSummaryofActivityofRestrictedSharesSubjecttoForfeitureDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#EmployeeStockPurchaseandStockIncentivePlansSummaryofActivityofRestrictedSharesSubjecttoForfeitureDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/EmployeeStockPurchaseandStockIncentivePlansSummaryofActivityofRestrictedSharesSubjecttoForfeitureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-74c4-8ed4-a4bddcf8c61a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-77e0-a6b1-254fb131b44e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-74c4-8ed4-a4bddcf8c61a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-77e0-a6b1-254fb131b44e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_01a025b9-db61-7d16-8802-a9e3bda02dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-77e0-a6b1-254fb131b44e" xlink:to="loc_us-gaap_AwardTypeAxis_01a025b9-db61-7d16-8802-a9e3bda02dd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-7d16-8802-a9e3bda02dd0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_01a025b9-db61-7d16-8802-a9e3bda02dd0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-7d16-8802-a9e3bda02dd0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-77c3-9c8e-a77d8562bc2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_01a025b9-db61-7d16-8802-a9e3bda02dd0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-77c3-9c8e-a77d8562bc2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_01a025b9-db61-7138-8ed8-6952dd23a9e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-db61-77c3-9c8e-a77d8562bc2e" xlink:to="loc_us-gaap_RestrictedStockMember_01a025b9-db61-7138-8ed8-6952dd23a9e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-db61-7a78-a353-6cca1b3aeaad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-74c4-8ed4-a4bddcf8c61a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-db61-7a78-a353-6cca1b3aeaad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_01a025b9-db61-7743-82ce-9e87373c885f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-db61-7a78-a353-6cca1b3aeaad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_01a025b9-db61-7743-82ce-9e87373c885f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_01a025b9-db61-7599-9576-9bab1651f2f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-db61-7a78-a353-6cca1b3aeaad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_01a025b9-db61-7599-9576-9bab1651f2f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_01a025b9-db61-703a-aedd-f30a2e29a9aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-db61-7a78-a353-6cca1b3aeaad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_01a025b9-db61-703a-aedd-f30a2e29a9aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod_01a025b9-db61-796b-b34d-f50e29a6c972" xlink:href="bwmn-20260930.xsd#bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-db61-7a78-a353-6cca1b3aeaad" xlink:to="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod_01a025b9-db61-796b-b34d-f50e29a6c972" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_01a025b9-db61-768a-b606-2f597c4d907b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-db61-7489-9f1e-677b4bf5e2fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-db61-74c4-8ed4-a4bddcf8c61a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-db61-7489-9f1e-677b4bf5e2fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_01a025b9-db61-78b2-b31b-0a09be1ce7cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-db61-7489-9f1e-677b4bf5e2fe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_01a025b9-db61-78b2-b31b-0a09be1ce7cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_01a025b9-db61-73d2-adb4-64539cbe299b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-db61-7489-9f1e-677b4bf5e2fe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_01a025b9-db61-73d2-adb4-64539cbe299b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_01a025b9-db61-7c1a-8263-6de882511ec6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-db61-7489-9f1e-677b4bf5e2fe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_01a025b9-db61-7c1a-8263-6de882511ec6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue_01a025b9-db61-7634-9350-3a0ffae4b51b" xlink:href="bwmn-20260930.xsd#bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-db61-7489-9f1e-677b4bf5e2fe" xlink:to="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue_01a025b9-db61-7634-9350-3a0ffae4b51b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_01a025b9-db61-7c0b-b0f2-aed4f27818b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/EmployeeStockPurchaseandStockIncentivePlansSummaryofActivityofPerformanceStockUnitsSubjecttoForfeitureDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#EmployeeStockPurchaseandStockIncentivePlansSummaryofActivityofPerformanceStockUnitsSubjecttoForfeitureDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/EmployeeStockPurchaseandStockIncentivePlansSummaryofActivityofPerformanceStockUnitsSubjecttoForfeitureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-dbfc-7173-b545-7440bb599c1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-7fab-8ae9-e4e364d47fae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-dbfc-7173-b545-7440bb599c1a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-7fab-8ae9-e4e364d47fae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_01a025b9-dbfc-7719-b102-a7318cc19f42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a025b9-db61-7fab-8ae9-e4e364d47fae" xlink:to="loc_us-gaap_AwardTypeAxis_01a025b9-dbfc-7719-b102-a7318cc19f42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-dbfc-7719-b102-a7318cc19f42_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_01a025b9-dbfc-7719-b102-a7318cc19f42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-dbfc-7719-b102-a7318cc19f42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-dbfc-791e-ae24-b9f6edea9702" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_01a025b9-dbfc-7719-b102-a7318cc19f42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-dbfc-791e-ae24-b9f6edea9702" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_01a025b9-dbfc-7d5e-b88b-1d8b0188b368" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_01a025b9-dbfc-791e-ae24-b9f6edea9702" xlink:to="loc_us-gaap_PerformanceSharesMember_01a025b9-dbfc-7d5e-b88b-1d8b0188b368" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-dbfc-71e3-abc4-d4528b3cd3ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-dbfc-7173-b545-7440bb599c1a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-dbfc-71e3-abc4-d4528b3cd3ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_01a025b9-dbfc-7f6b-88db-431de33397b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-dbfc-71e3-abc4-d4528b3cd3ae" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_01a025b9-dbfc-7f6b-88db-431de33397b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_01a025b9-dbfc-7561-8db1-87bbe0c037b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-dbfc-71e3-abc4-d4528b3cd3ae" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_01a025b9-dbfc-7561-8db1-87bbe0c037b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_01a025b9-dbfc-78f8-ace2-2e3660cd8c2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-dbfc-71e3-abc4-d4528b3cd3ae" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_01a025b9-dbfc-78f8-ace2-2e3660cd8c2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod_01a025b9-dbfc-73f4-aa5a-6daa739f812e" xlink:href="bwmn-20260930.xsd#bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_01a025b9-dbfc-71e3-abc4-d4528b3cd3ae" xlink:to="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod_01a025b9-dbfc-73f4-aa5a-6daa739f812e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_01a025b9-dbfc-7644-a349-b3e04807cbf3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-dbfc-7a84-b1c6-328f8074a3e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a025b9-dbfc-7173-b545-7440bb599c1a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-dbfc-7a84-b1c6-328f8074a3e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_01a025b9-dbfc-7458-aabd-6f72c7feab23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-dbfc-7a84-b1c6-328f8074a3e7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_01a025b9-dbfc-7458-aabd-6f72c7feab23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_01a025b9-dbfc-7158-8843-bc7682eae32c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-dbfc-7a84-b1c6-328f8074a3e7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_01a025b9-dbfc-7158-8843-bc7682eae32c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_01a025b9-dbfc-7c06-b9be-114d119be99d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-dbfc-7a84-b1c6-328f8074a3e7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_01a025b9-dbfc-7c06-b9be-114d119be99d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue_01a025b9-dbfc-7aff-8622-a57153a0e692" xlink:href="bwmn-20260930.xsd#bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_01a025b9-dbfc-7a84-b1c6-328f8074a3e7" xlink:to="loc_bwmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue_01a025b9-dbfc-7aff-8622-a57153a0e692" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_01a025b9-dbfc-73a4-8fcf-d5a513288f8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/LeasesAdditionalInformationDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#LeasesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/LeasesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_01a025b9-dbfc-7188-9ef4-319f65ba4d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_01a025b9-dbfc-7cd1-8b99-258bfc78b80e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_01a025b9-dbfc-7188-9ef4-319f65ba4d5c" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_01a025b9-dbfc-7cd1-8b99-258bfc78b80e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a025b9-dbfc-7ba6-ba21-36d1e44893b1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_01a025b9-dbfc-7cd1-8b99-258bfc78b80e" xlink:to="loc_srt_RangeAxis_01a025b9-dbfc-7ba6-ba21-36d1e44893b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-dbfc-7ba6-ba21-36d1e44893b1_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a025b9-dbfc-7ba6-ba21-36d1e44893b1" xlink:to="loc_srt_RangeMember_01a025b9-dbfc-7ba6-ba21-36d1e44893b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a025b9-dbfc-7eb9-a221-85699e2bf9dd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a025b9-dbfc-7ba6-ba21-36d1e44893b1" xlink:to="loc_srt_RangeMember_01a025b9-dbfc-7eb9-a221-85699e2bf9dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a025b9-dbfc-7cc2-ad33-385206c017c4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-dbfc-7eb9-a221-85699e2bf9dd" xlink:to="loc_srt_MinimumMember_01a025b9-dbfc-7cc2-ad33-385206c017c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a025b9-dbfc-7694-b5ee-2975875cfe5d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a025b9-dbfc-7eb9-a221-85699e2bf9dd" xlink:to="loc_srt_MaximumMember_01a025b9-dbfc-7694-b5ee-2975875cfe5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeFinanceLeaseTermOfContract1_01a025b9-dbfc-725b-bf78-e0e0be9a7fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeFinanceLeaseTermOfContract1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_01a025b9-dbfc-7188-9ef4-319f65ba4d5c" xlink:to="loc_us-gaap_LesseeFinanceLeaseTermOfContract1_01a025b9-dbfc-725b-bf78-e0e0be9a7fc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_OperatingLeaseLiabilitySubleaseIncome_01a025b9-dbfc-700b-94bd-3945a466db44" xlink:href="bwmn-20260930.xsd#bwmn_OperatingLeaseLiabilitySubleaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_01a025b9-dbfc-7188-9ef4-319f65ba4d5c" xlink:to="loc_bwmn_OperatingLeaseLiabilitySubleaseIncome_01a025b9-dbfc-700b-94bd-3945a466db44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_01a025b9-dbfc-7d33-ba7a-88663887ed8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_01a025b9-dbfc-7188-9ef4-319f65ba4d5c" xlink:to="loc_us-gaap_OperatingLeaseLiability_01a025b9-dbfc-7d33-ba7a-88663887ed8c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_FinanceLeaseLiabilityBargainPurchasePrice_01a025b9-dbfc-76cd-8a55-686d0b155ed5" xlink:href="bwmn-20260930.xsd#bwmn_FinanceLeaseLiabilityBargainPurchasePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_01a025b9-dbfc-7188-9ef4-319f65ba4d5c" xlink:to="loc_bwmn_FinanceLeaseLiabilityBargainPurchasePrice_01a025b9-dbfc-76cd-8a55-686d0b155ed5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_01a025b9-dbfc-75c3-aeb8-ceca6aebdaee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_01a025b9-dbfc-7188-9ef4-319f65ba4d5c" xlink:to="loc_us-gaap_FinanceLeaseLiability_01a025b9-dbfc-75c3-aeb8-ceca6aebdaee" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/SegmentSummaryofOperatingFinancialResultsDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#SegmentSummaryofOperatingFinancialResultsDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/SegmentSummaryofOperatingFinancialResultsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_01a025b9-dbfc-76a0-98e1-259a686f641c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a025b9-dbfc-7721-87fd-ecf808d991d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a025b9-dbfc-76a0-98e1-259a686f641c" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a025b9-dbfc-7721-87fd-ecf808d991d0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_01a025b9-dbfc-75c5-9883-ba5a9c845bf2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a025b9-dbfc-7721-87fd-ecf808d991d0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_01a025b9-dbfc-75c5-9883-ba5a9c845bf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a025b9-dbfc-75c5-9883-ba5a9c845bf2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a025b9-dbfc-75c5-9883-ba5a9c845bf2" xlink:to="loc_us-gaap_SegmentDomain_01a025b9-dbfc-75c5-9883-ba5a9c845bf2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a025b9-dbfc-70f4-848a-dbdf0916af8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a025b9-dbfc-75c5-9883-ba5a9c845bf2" xlink:to="loc_us-gaap_SegmentDomain_01a025b9-dbfc-70f4-848a-dbdf0916af8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_ReportableSegmentMember_01a025b9-dbfc-7db0-9153-5d18a13e8aea" xlink:href="bwmn-20260930.xsd#bwmn_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a025b9-dbfc-70f4-848a-dbdf0916af8e" xlink:to="loc_bwmn_ReportableSegmentMember_01a025b9-dbfc-7db0-9153-5d18a13e8aea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a025b9-dbfc-7067-b11b-eff704c6e5f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a025b9-dbfc-76a0-98e1-259a686f641c" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a025b9-dbfc-7067-b11b-eff704c6e5f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a025b9-dbfc-76a0-98e1-259a686f641c" xlink:to="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_01a025b9-dbfc-7408-a2d6-e9c99dfa6b2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:to="loc_us-gaap_LaborAndRelatedExpense_01a025b9-dbfc-7408-a2d6-e9c99dfa6b2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_01a025b9-dbfc-7bde-baa0-7adc4ecc84c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_01a025b9-dbfc-7bde-baa0-7adc4ecc84c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_01a025b9-dbfc-7cd7-8b6b-31f9ea0d57d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_01a025b9-dbfc-7cd7-8b6b-31f9ea0d57d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncentiveFeeExpense_01a025b9-dbfc-7544-b58c-02de015b0182" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncentiveFeeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:to="loc_us-gaap_IncentiveFeeExpense_01a025b9-dbfc-7544-b58c-02de015b0182" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_01a025b9-dbfc-783e-a1a1-a0d702fb9548" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:to="loc_us-gaap_DepreciationAndAmortization_01a025b9-dbfc-783e-a1a1-a0d702fb9548" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_01a025b9-dbfc-7864-adda-3ff83dba10f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:to="loc_us-gaap_InterestExpenseNonoperating_01a025b9-dbfc-7864-adda-3ff83dba10f0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_01a025b9-dbfc-7999-ac40-aa571e377866" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_01a025b9-dbfc-7999-ac40-aa571e377866" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_01a025b9-dbfc-70b9-9471-232507866cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_01a025b9-dbfc-7333-a629-cb84fb8089cb" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_01a025b9-dbfc-70b9-9471-232507866cd3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_01a025b9-dbfc-7c1a-a378-cf44be96d261" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a025b9-dbfc-76a0-98e1-259a686f641c" xlink:to="loc_us-gaap_NetIncomeLoss_01a025b9-dbfc-7c1a-a378-cf44be96d261" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.bowman.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="bwmn-20260930.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.bowman.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_01a025b9-dbfc-754d-8f44-37969f4a3ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_01a025b9-dbfc-722e-a2f1-28da358de23b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a025b9-dbfc-754d-8f44-37969f4a3ffc" xlink:to="loc_us-gaap_SubsequentEventTable_01a025b9-dbfc-722e-a2f1-28da358de23b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-dbfc-7528-ad77-21aa2e079057" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_01a025b9-dbfc-722e-a2f1-28da358de23b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-dbfc-7528-ad77-21aa2e079057" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-dbfc-7528-ad77-21aa2e079057_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-dbfc-7528-ad77-21aa2e079057" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-dbfc-7528-ad77-21aa2e079057_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-dbfc-778b-9df8-07073a3ac160" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a025b9-dbfc-7528-ad77-21aa2e079057" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-dbfc-778b-9df8-07073a3ac160" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_PriveParentInc.AndPriveMergerSubInc.Member_01a025b9-dbfc-7327-a272-fca11f587cd0" xlink:href="bwmn-20260930.xsd#bwmn_PriveParentInc.AndPriveMergerSubInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-dbfc-778b-9df8-07073a3ac160" xlink:to="loc_bwmn_PriveParentInc.AndPriveMergerSubInc.Member_01a025b9-dbfc-7327-a272-fca11f587cd0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_DymapticMember_01a19a01-fee9-7c60-84a1-4acad493533f" xlink:href="bwmn-20260930.xsd#bwmn_DymapticMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a025b9-dbfc-778b-9df8-07073a3ac160" xlink:to="loc_bwmn_DymapticMember_01a19a01-fee9-7c60-84a1-4acad493533f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_01a19a04-bdd2-7e4e-8c23-a2ad26e00ebf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_01a025b9-dbfc-722e-a2f1-28da358de23b" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_01a19a04-bdd2-7e4e-8c23-a2ad26e00ebf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_01a19a04-bdd2-7e4e-8c23-a2ad26e00ebf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_01a19a04-bdd2-7e4e-8c23-a2ad26e00ebf" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_01a19a04-bdd2-7e4e-8c23-a2ad26e00ebf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_01a19a04-bdd2-71ad-9258-4e0c27be0e61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_01a19a04-bdd2-7e4e-8c23-a2ad26e00ebf" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_01a19a04-bdd2-71ad-9258-4e0c27be0e61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_01a19a05-1e5a-7326-99d7-949d2ba9523f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_01a19a04-bdd2-71ad-9258-4e0c27be0e61" xlink:to="loc_us-gaap_SubsequentEventMember_01a19a05-1e5a-7326-99d7-949d2ba9523f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_01a025b9-dbfc-7848-b5cb-e090ce70296e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a025b9-dbfc-754d-8f44-37969f4a3ffc" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_01a025b9-dbfc-7848-b5cb-e090ce70296e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationTerminationFees_01a025b9-dbfc-7245-ab8c-98b4be3c33ca" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationTerminationFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a025b9-dbfc-754d-8f44-37969f4a3ffc" xlink:to="loc_bwmn_BusinessCombinationTerminationFees_01a025b9-dbfc-7245-ab8c-98b4be3c33ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_01a199fe-0e7e-79c6-ad25-48f622fc48b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a025b9-dbfc-754d-8f44-37969f4a3ffc" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_01a199fe-0e7e-79c6-ad25-48f622fc48b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_01a199fe-0e7e-75e7-b528-6ddb85ed9071" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a025b9-dbfc-754d-8f44-37969f4a3ffc" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_01a199fe-0e7e-75e7-b528-6ddb85ed9071" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_NumberOfPromissoryNotesAcquired_01a199fe-0e7e-7a15-9a9c-c02be75bee0d" xlink:href="bwmn-20260930.xsd#bwmn_NumberOfPromissoryNotesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a025b9-dbfc-754d-8f44-37969f4a3ffc" xlink:to="loc_bwmn_NumberOfPromissoryNotesAcquired_01a199fe-0e7e-7a15-9a9c-c02be75bee0d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BusinessCombinationContingentConsiderationPromissoryNotes_01a199fe-0e7e-7d88-b460-336184d87d8d" xlink:href="bwmn-20260930.xsd#bwmn_BusinessCombinationContingentConsiderationPromissoryNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a025b9-dbfc-754d-8f44-37969f4a3ffc" xlink:to="loc_bwmn_BusinessCombinationContingentConsiderationPromissoryNotes_01a199fe-0e7e-7d88-b460-336184d87d8d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_01a19a01-0d05-7b62-993e-0766d378f4ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a025b9-dbfc-754d-8f44-37969f4a3ffc" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_01a19a01-0d05-7b62-993e-0766d378f4ac" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-roles-2026.xsd#eedm1"/>
  <link:definitionLink xlink:role="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="101"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_DanielSwayzeMember_01a025b9-da05-7a0b-81f4-bf64284108af" xlink:href="bwmn-20260930.xsd#bwmn_DanielSwayzeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_bwmn_DanielSwayzeMember_01a025b9-da05-7a0b-81f4-bf64284108af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_BruceLabovitzMember_01a025b9-dabf-7833-b3a9-b3140de88d78" xlink:href="bwmn-20260930.xsd#bwmn_BruceLabovitzMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_bwmn_BruceLabovitzMember_01a025b9-dabf-7833-b3a9-b3140de88d78" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_GaryBowmanMember_01a025b9-dbfd-70fc-bc1a-b8e6c3b5a3dc" xlink:href="bwmn-20260930.xsd#bwmn_GaryBowmanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_bwmn_GaryBowmanMember_01a025b9-dbfd-70fc-bc1a-b8e6c3b5a3dc" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/TradingArrangementsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#TradingArrangmentsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/TradingArrangementsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllTradingArrangementsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllTradingArrangementsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_GaryBowmanTradingPlanCommonStockMember_01a025b9-dbfd-7fea-bb99-2d38ad13ba56" xlink:href="bwmn-20260930.xsd#bwmn_GaryBowmanTradingPlanCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_bwmn_GaryBowmanTradingPlanCommonStockMember_01a025b9-dbfd-7fea-bb99-2d38ad13ba56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_GaryBowmanTradingPlanCommonStockGiftMember_01a025b9-dbfd-7870-b7b0-33982e6cc48d" xlink:href="bwmn-20260930.xsd#bwmn_GaryBowmanTradingPlanCommonStockGiftMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_bwmn_GaryBowmanTradingPlanCommonStockGiftMember_01a025b9-dbfd-7870-b7b0-33982e6cc48d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bwmn_GaryBowmanTradingPlanCommonStockBFAMMember_01a025b9-dbfd-705e-833d-a2892738c465" xlink:href="bwmn-20260930.xsd#bwmn_GaryBowmanTradingPlanCommonStockBFAMMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_bwmn_GaryBowmanTradingPlanCommonStockBFAMMember_01a025b9-dbfd-705e-833d-a2892738c465" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
