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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e2c86-b775-7a37-b0b9-7ca4b78a78bd,g:dd30a349-1227-4120-9478-023ba0301a6c-->
<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://progyny.com/role/ConsolidatedStatementsofChangesinStockholdersEquity" xlink:type="simple" xlink:href="pgny-20260630.xsd#ConsolidatedStatementsofChangesinStockholdersEquity"/>
  <link:definitionLink xlink:role="http://progyny.com/role/ConsolidatedStatementsofChangesinStockholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e2c86-b84e-7702-aae3-1b23bb2fb871" 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_019e2c86-b84e-7d04-ab08-826b0c4823b7" 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_019e2c86-b84e-7702-aae3-1b23bb2fb871" xlink:to="loc_us-gaap_StatementTable_019e2c86-b84e-7d04-ab08-826b0c4823b7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e2c86-b84e-7868-83ba-7885b8c893d5" 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_019e2c86-b84e-7d04-ab08-826b0c4823b7" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e2c86-b84e-7868-83ba-7885b8c893d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2c86-b84e-7868-83ba-7885b8c893d5_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_019e2c86-b84e-7868-83ba-7885b8c893d5" xlink:to="loc_us-gaap_EquityComponentDomain_019e2c86-b84e-7868-83ba-7885b8c893d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2c86-b84e-7abe-b4e1-7f7653840e3c" 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_019e2c86-b84e-7868-83ba-7885b8c893d5" xlink:to="loc_us-gaap_EquityComponentDomain_019e2c86-b84e-7abe-b4e1-7f7653840e3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e2c86-b84e-7b7b-9f6f-38f0a02faad9" 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_019e2c86-b84e-7abe-b4e1-7f7653840e3c" xlink:to="loc_us-gaap_CommonStockMember_019e2c86-b84e-7b7b-9f6f-38f0a02faad9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019e2c86-b84e-7853-86c9-49589030b5fe" 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_019e2c86-b84e-7abe-b4e1-7f7653840e3c" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019e2c86-b84e-7853-86c9-49589030b5fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e2c86-b84e-7621-9891-3502f8e933fc" 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_019e2c86-b84e-7abe-b4e1-7f7653840e3c" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e2c86-b84e-7621-9891-3502f8e933fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e2c86-b84e-75ff-be26-98991d684f61" 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_019e2c86-b84e-7abe-b4e1-7f7653840e3c" xlink:to="loc_us-gaap_RetainedEarningsMember_019e2c86-b84e-75ff-be26-98991d684f61" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2c86-b84e-754b-af82-cac50a75ad64" 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_019e2c86-b84e-7abe-b4e1-7f7653840e3c" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2c86-b84e-754b-af82-cac50a75ad64" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" 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_019e2c86-b84e-7702-aae3-1b23bb2fb871" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e2c86-b84e-7cf9-a2f4-433a68bf3c2e" 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_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e2c86-b84e-7cf9-a2f4-433a68bf3c2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2c86-b84e-74ec-b0f2-41de32922259" 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_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:to="loc_us-gaap_StockholdersEquity_019e2c86-b84e-74ec-b0f2-41de32922259" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019e2c86-b84e-75bd-a14a-15b8a9b04884" 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_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019e2c86-b84e-75bd-a14a-15b8a9b04884" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_019e2c86-b84e-7488-9301-1526bc30dc15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:to="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_019e2c86-b84e-7488-9301-1526bc30dc15" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e2c86-b84e-7c5d-b493-e85db7f1bd31" 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_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e2c86-b84e-7c5d-b493-e85db7f1bd31" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_019f9312-5f32-7bdd-8970-2b391f8f65c2" 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_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_019f9312-5f32-7bdd-8970-2b391f8f65c2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_019f9313-1a29-7909-8412-d209f9331add" 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_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_019f9313-1a29-7909-8412-d209f9331add" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e2c86-b84e-727b-a8f5-1925df8521f9" 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_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e2c86-b84e-727b-a8f5-1925df8521f9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2c86-b84e-749d-8726-ed976513c0c3" 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_019e2c86-b84e-769e-93d1-8ccaadaf8dc0" xlink:to="loc_us-gaap_NetIncomeLoss_019e2c86-b84e-749d-8726-ed976513c0c3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e2c86-b84e-7dba-af00-7e16f750e990" 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_019e2c86-b84e-7232-a606-2f7dacb064d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/SignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#SignificantAccountingPoliciesRevenueRecognitionDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/SignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-7754-b2a7-63b467e652ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019e2c86-b84f-78c7-bf18-503169824e56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-7754-b2a7-63b467e652ec" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019e2c86-b84f-78c7-bf18-503169824e56" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2c86-b84f-7336-965f-9a16b46dfc70" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019e2c86-b84f-78c7-bf18-503169824e56" xlink:to="loc_srt_RangeAxis_019e2c86-b84f-7336-965f-9a16b46dfc70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2c86-b84f-7336-965f-9a16b46dfc70_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_019e2c86-b84f-7336-965f-9a16b46dfc70" xlink:to="loc_srt_RangeMember_019e2c86-b84f-7336-965f-9a16b46dfc70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2c86-b84f-7074-8b16-085caf358122" 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_019e2c86-b84f-7336-965f-9a16b46dfc70" xlink:to="loc_srt_RangeMember_019e2c86-b84f-7074-8b16-085caf358122" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2c86-b84f-7faf-823b-59028e1494f9" 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_019e2c86-b84f-7074-8b16-085caf358122" xlink:to="loc_srt_MinimumMember_019e2c86-b84f-7faf-823b-59028e1494f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2c86-b84f-73b5-8003-c981abb1d8c8" 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_019e2c86-b84f-7074-8b16-085caf358122" xlink:to="loc_srt_MaximumMember_019e2c86-b84f-73b5-8003-c981abb1d8c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_RevenueFromContractWithCustomerTerm_019e2c86-b84f-7e49-9461-d970bf43015d" xlink:href="pgny-20260630.xsd#pgny_RevenueFromContractWithCustomerTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-7754-b2a7-63b467e652ec" xlink:to="loc_pgny_RevenueFromContractWithCustomerTerm_019e2c86-b84f-7e49-9461-d970bf43015d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_ContractTerminationNoticePeriod_019e2c86-b84f-776b-9322-344b8024819e" xlink:href="pgny-20260630.xsd#pgny_ContractTerminationNoticePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-7754-b2a7-63b467e652ec" xlink:to="loc_pgny_ContractTerminationNoticePeriod_019e2c86-b84f-776b-9322-344b8024819e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_CustomerPaymentTerms_019e2c86-b84f-766e-9b7b-88af4387ced2" xlink:href="pgny-20260630.xsd#pgny_CustomerPaymentTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-7754-b2a7-63b467e652ec" xlink:to="loc_pgny_CustomerPaymentTerms_019e2c86-b84f-766e-9b7b-88af4387ced2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_RevenueRemainingPerformanceObligationRemainingContractTerm_019e2c86-b84f-7218-aeee-309d94580c50" xlink:href="pgny-20260630.xsd#pgny_RevenueRemainingPerformanceObligationRemainingContractTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-7754-b2a7-63b467e652ec" xlink:to="loc_pgny_RevenueRemainingPerformanceObligationRemainingContractTerm_019e2c86-b84f-7218-aeee-309d94580c50" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/SignificantAccountingPoliciesCostofServicesDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#SignificantAccountingPoliciesCostofServicesDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/SignificantAccountingPoliciesCostofServicesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-774b-bb78-3b6c2e089d40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019e2c86-b84f-7026-bbfb-2d032cb4836b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-774b-bb78-3b6c2e089d40" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019e2c86-b84f-7026-bbfb-2d032cb4836b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2c86-b84f-7358-95b6-03294eda4e9d" 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019e2c86-b84f-7026-bbfb-2d032cb4836b" xlink:to="loc_srt_RangeAxis_019e2c86-b84f-7358-95b6-03294eda4e9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2c86-b84f-7358-95b6-03294eda4e9d_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_019e2c86-b84f-7358-95b6-03294eda4e9d" xlink:to="loc_srt_RangeMember_019e2c86-b84f-7358-95b6-03294eda4e9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2c86-b84f-70ee-9467-724d0366c9eb" 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_019e2c86-b84f-7358-95b6-03294eda4e9d" xlink:to="loc_srt_RangeMember_019e2c86-b84f-70ee-9467-724d0366c9eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2c86-b84f-7d0b-968f-767e1adfb862" 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_019e2c86-b84f-70ee-9467-724d0366c9eb" xlink:to="loc_srt_MinimumMember_019e2c86-b84f-7d0b-968f-767e1adfb862" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2c86-b84f-70c7-a2ea-04b46d543735" 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_019e2c86-b84f-70ee-9467-724d0366c9eb" xlink:to="loc_srt_MaximumMember_019e2c86-b84f-70c7-a2ea-04b46d543735" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_ContractTermClinics_019e2c86-b84f-7cca-94be-5af4c78c3ccc" xlink:href="pgny-20260630.xsd#pgny_ContractTermClinics"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-774b-bb78-3b6c2e089d40" xlink:to="loc_pgny_ContractTermClinics_019e2c86-b84f-7cca-94be-5af4c78c3ccc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_CostOfGoodsAndServiceSoldSpecialtyPharmaciesContractTerm_019e2c86-b84f-728b-a8f4-5c7a2dca87e5" xlink:href="pgny-20260630.xsd#pgny_CostOfGoodsAndServiceSoldSpecialtyPharmaciesContractTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-774b-bb78-3b6c2e089d40" xlink:to="loc_pgny_CostOfGoodsAndServiceSoldSpecialtyPharmaciesContractTerm_019e2c86-b84f-728b-a8f4-5c7a2dca87e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_BillingTerms_019e2c86-b84f-7c89-937b-a389167a4d19" xlink:href="pgny-20260630.xsd#pgny_BillingTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019e2c86-b84f-774b-bb78-3b6c2e089d40" xlink:to="loc_pgny_BillingTerms_019e2c86-b84f-7c89-937b-a389167a4d19" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/RevenueDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#RevenueDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/RevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2c86-b84f-7fa6-a531-6c717ddbfe86" 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_019e2c86-b84f-7f3d-902d-75cca1f6f340" 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_019e2c86-b84f-7fa6-a531-6c717ddbfe86" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e2c86-b84f-7f3d-902d-75cca1f6f340" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e2c86-b84f-715a-a35a-6042b58fe485" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e2c86-b84f-7f3d-902d-75cca1f6f340" xlink:to="loc_srt_ProductOrServiceAxis_019e2c86-b84f-715a-a35a-6042b58fe485" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e2c86-b84f-715a-a35a-6042b58fe485_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e2c86-b84f-715a-a35a-6042b58fe485" xlink:to="loc_srt_ProductsAndServicesDomain_019e2c86-b84f-715a-a35a-6042b58fe485_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e2c86-b84f-7eaf-a86b-d223d55973c1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e2c86-b84f-715a-a35a-6042b58fe485" xlink:to="loc_srt_ProductsAndServicesDomain_019e2c86-b84f-7eaf-a86b-d223d55973c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_FertilityBenefitServicesMember_019e2c86-b84f-7b53-b084-4602fa56c0a9" xlink:href="pgny-20260630.xsd#pgny_FertilityBenefitServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2c86-b84f-7eaf-a86b-d223d55973c1" xlink:to="loc_pgny_FertilityBenefitServicesMember_019e2c86-b84f-7b53-b084-4602fa56c0a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_PharmacyBenefitServicesMember_019e2c86-b84f-721f-b065-dc2d781c8f2c" xlink:href="pgny-20260630.xsd#pgny_PharmacyBenefitServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2c86-b84f-7eaf-a86b-d223d55973c1" xlink:to="loc_pgny_PharmacyBenefitServicesMember_019e2c86-b84f-721f-b065-dc2d781c8f2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019e2c86-b84f-7467-af4c-60a11fc07fab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2c86-b84f-7fa6-a531-6c717ddbfe86" xlink:to="loc_us-gaap_RevenuesAbstract_019e2c86-b84f-7467-af4c-60a11fc07fab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2c86-b84f-7b34-bdf2-c4492dda94e8" 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_RevenuesAbstract_019e2c86-b84f-7467-af4c-60a11fc07fab" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2c86-b84f-7b34-bdf2-c4492dda94e8" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/FairValueofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#FairValueofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/FairValueofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eb52e-713f-72b9-9d87-622b1b17e94d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2c86-b84f-7140-b5c6-f0ed2bec0e6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eb52e-713f-72b9-9d87-622b1b17e94d" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2c86-b84f-7140-b5c6-f0ed2bec0e6e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019eb52e-713f-7df4-8cb0-790e30919e30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2c86-b84f-7140-b5c6-f0ed2bec0e6e" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019eb52e-713f-7df4-8cb0-790e30919e30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019eb52e-713f-7df4-8cb0-790e30919e30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019eb52e-713f-7df4-8cb0-790e30919e30" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019eb52e-713f-7df4-8cb0-790e30919e30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019eb52e-713f-7ffd-8f3a-e2493f47de99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019eb52e-713f-7df4-8cb0-790e30919e30" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019eb52e-713f-7ffd-8f3a-e2493f47de99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_019eb52e-713f-7973-88d6-8c4381729ce0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019eb52e-713f-7ffd-8f3a-e2493f47de99" xlink:to="loc_us-gaap_MoneyMarketFundsMember_019eb52e-713f-7973-88d6-8c4381729ce0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019eb52e-713f-736f-9b5a-f1d3fd7c092d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2c86-b84f-7140-b5c6-f0ed2bec0e6e" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019eb52e-713f-736f-9b5a-f1d3fd7c092d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eb52e-713f-736f-9b5a-f1d3fd7c092d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019eb52e-713f-736f-9b5a-f1d3fd7c092d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eb52e-713f-736f-9b5a-f1d3fd7c092d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eb52e-713f-74e3-bc00-67b4efacc11e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019eb52e-713f-736f-9b5a-f1d3fd7c092d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eb52e-713f-74e3-bc00-67b4efacc11e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019eb52e-713f-7ef7-af5b-0e9c84702538" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eb52e-713f-74e3-bc00-67b4efacc11e" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019eb52e-713f-7ef7-af5b-0e9c84702538" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019eb52e-713f-7327-b908-469bbe5fb7f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eb52e-713f-74e3-bc00-67b4efacc11e" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019eb52e-713f-7327-b908-469bbe5fb7f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019eb52e-713f-7b98-bf3b-a1d85af1755d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eb52e-713f-74e3-bc00-67b4efacc11e" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019eb52e-713f-7b98-bf3b-a1d85af1755d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019eb52e-713f-7ca0-b44f-315009b223fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eb52e-713f-72b9-9d87-622b1b17e94d" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019eb52e-713f-7ca0-b44f-315009b223fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019eb52e-713f-7de7-9fa0-ae7c3651f46a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eb52e-713f-72b9-9d87-622b1b17e94d" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019eb52e-713f-7de7-9fa0-ae7c3651f46a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating_019eb52e-713f-7e21-bdc7-de458d744335" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eb52e-713f-72b9-9d87-622b1b17e94d" xlink:to="loc_us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating_019eb52e-713f-7e21-bdc7-de458d744335" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019eb52e-713f-70d0-8ebd-35dfb2f5d783" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eb52e-713f-72b9-9d87-622b1b17e94d" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019eb52e-713f-70d0-8ebd-35dfb2f5d783" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019eb52e-713f-7a0b-8cbd-68e9c6790dfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eb52e-713f-72b9-9d87-622b1b17e94d" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019eb52e-713f-7a0b-8cbd-68e9c6790dfe" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e2c86-b84f-7ca3-9c0b-5e81816788a6" 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_019e2c86-b84f-7e76-bbe8-0bca4c244913" 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_019e2c86-b84f-7ca3-9c0b-5e81816788a6" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019e2c86-b84f-7e76-bbe8-0bca4c244913" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_019e2c86-b84f-7346-8961-9f5af24ceb35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019e2c86-b84f-7e76-bbe8-0bca4c244913" xlink:to="loc_us-gaap_LeaseContractualTermAxis_019e2c86-b84f-7346-8961-9f5af24ceb35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_019e2c86-b84f-7346-8961-9f5af24ceb35_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_019e2c86-b84f-7346-8961-9f5af24ceb35" xlink:to="loc_us-gaap_LeaseContractualTermDomain_019e2c86-b84f-7346-8961-9f5af24ceb35_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_019e2c86-b84f-7fa2-a3f4-9dcb877124d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_019e2c86-b84f-7346-8961-9f5af24ceb35" xlink:to="loc_us-gaap_LeaseContractualTermDomain_019e2c86-b84f-7fa2-a3f4-9dcb877124d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_ThroughFifthLeaseYearMember_019e2c86-b84f-7602-adb7-bfcf1e2d2b85" xlink:href="pgny-20260630.xsd#pgny_ThroughFifthLeaseYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_019e2c86-b84f-7fa2-a3f4-9dcb877124d1" xlink:to="loc_pgny_ThroughFifthLeaseYearMember_019e2c86-b84f-7602-adb7-bfcf1e2d2b85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_AfterFifthLeaseYearMember_019e2c86-b84f-7c6b-8bab-b471bb81e0a2" xlink:href="pgny-20260630.xsd#pgny_AfterFifthLeaseYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_019e2c86-b84f-7fa2-a3f4-9dcb877124d1" xlink:to="loc_pgny_AfterFifthLeaseYearMember_019e2c86-b84f-7c6b-8bab-b471bb81e0a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019e2c86-b84f-700e-948c-04430c189f39" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019e2c86-b84f-7e76-bbe8-0bca4c244913" xlink:to="loc_srt_StatementScenarioAxis_019e2c86-b84f-700e-948c-04430c189f39" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019e2c86-b84f-700e-948c-04430c189f39_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019e2c86-b84f-700e-948c-04430c189f39" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019e2c86-b84f-700e-948c-04430c189f39_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019e2c86-b84f-7f2f-9a03-09e2adeabcfc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019e2c86-b84f-700e-948c-04430c189f39" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019e2c86-b84f-7f2f-9a03-09e2adeabcfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019e2c86-b84f-70da-8420-b6f50731da1d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019e2c86-b84f-7f2f-9a03-09e2adeabcfc" xlink:to="loc_srt_ScenarioForecastMember_019e2c86-b84f-70da-8420-b6f50731da1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_LeaseDescriptionAxis_019e2c86-b84f-791d-9bed-882ab4276c78" xlink:href="pgny-20260630.xsd#pgny_LeaseDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019e2c86-b84f-7e76-bbe8-0bca4c244913" xlink:to="loc_pgny_LeaseDescriptionAxis_019e2c86-b84f-791d-9bed-882ab4276c78" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_LeaseDescriptionDomain_019e2c86-b84f-791d-9bed-882ab4276c78_default" xlink:href="pgny-20260630.xsd#pgny_LeaseDescriptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_pgny_LeaseDescriptionAxis_019e2c86-b84f-791d-9bed-882ab4276c78" xlink:to="loc_pgny_LeaseDescriptionDomain_019e2c86-b84f-791d-9bed-882ab4276c78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_LeaseDescriptionDomain_019e2c86-b84f-74e7-96b4-a71af676b4dd" xlink:href="pgny-20260630.xsd#pgny_LeaseDescriptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_pgny_LeaseDescriptionAxis_019e2c86-b84f-791d-9bed-882ab4276c78" xlink:to="loc_pgny_LeaseDescriptionDomain_019e2c86-b84f-74e7-96b4-a71af676b4dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_September2019SubleaseAgreementMember_019e2c86-b84f-76dd-9e68-943c35fba446" xlink:href="pgny-20260630.xsd#pgny_September2019SubleaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pgny_LeaseDescriptionDomain_019e2c86-b84f-74e7-96b4-a71af676b4dd" xlink:to="loc_pgny_September2019SubleaseAgreementMember_019e2c86-b84f-76dd-9e68-943c35fba446" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_Februray2023LeaseAgreementMember_019e2c86-b84f-752c-b5fb-0484b1165967" xlink:href="pgny-20260630.xsd#pgny_Februray2023LeaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pgny_LeaseDescriptionDomain_019e2c86-b84f-74e7-96b4-a71af676b4dd" xlink:to="loc_pgny_Februray2023LeaseAgreementMember_019e2c86-b84f-752c-b5fb-0484b1165967" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_March2025LeaseAgreementMember_019e2c86-b84f-70bd-9ebe-72e2b25aa740" xlink:href="pgny-20260630.xsd#pgny_March2025LeaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pgny_LeaseDescriptionDomain_019e2c86-b84f-74e7-96b4-a71af676b4dd" xlink:to="loc_pgny_March2025LeaseAgreementMember_019e2c86-b84f-70bd-9ebe-72e2b25aa740" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_019e2c86-b84f-7711-b0b2-d1e3b1a1ddb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseDescriptionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e2c86-b84f-7ca3-9c0b-5e81816788a6" xlink:to="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_019e2c86-b84f-7711-b0b2-d1e3b1a1ddb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AreaOfRealEstateProperty_019e2c86-b84f-7486-bd0d-7adde75ddae3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AreaOfRealEstateProperty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_019e2c86-b84f-7711-b0b2-d1e3b1a1ddb3" xlink:to="loc_us-gaap_AreaOfRealEstateProperty_019e2c86-b84f-7486-bd0d-7adde75ddae3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_OperatingLeaseBaseRentPerAnnum_019e2c86-b84f-7ad5-9aee-8e71f826ce66" xlink:href="pgny-20260630.xsd#pgny_OperatingLeaseBaseRentPerAnnum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_019e2c86-b84f-7711-b0b2-d1e3b1a1ddb3" xlink:to="loc_pgny_OperatingLeaseBaseRentPerAnnum_019e2c86-b84f-7ad5-9aee-8e71f826ce66" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019e2c86-b84f-7b77-a6f1-3db64c6f5685" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_019e2c86-b84f-7711-b0b2-d1e3b1a1ddb3" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019e2c86-b84f-7b77-a6f1-3db64c6f5685" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019e2c86-b84f-730b-b706-e02501ef6438" 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_LesseeOperatingLeaseDescriptionAbstract_019e2c86-b84f-7711-b0b2-d1e3b1a1ddb3" xlink:to="loc_us-gaap_OperatingLeaseLiability_019e2c86-b84f-730b-b706-e02501ef6438" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_019e2c86-b84f-7389-a4f3-14ee7f3d962e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_019e2c86-b84f-7711-b0b2-d1e3b1a1ddb3" xlink:to="loc_us-gaap_OperatingLeaseExpense_019e2c86-b84f-7389-a4f3-14ee7f3d962e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_019e2c86-b84f-76f2-8eb8-276f1db89d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_019e2c86-b84f-7711-b0b2-d1e3b1a1ddb3" xlink:to="loc_us-gaap_OperatingLeasePayments_019e2c86-b84f-76f2-8eb8-276f1db89d7f" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/DebtDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#DebtDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/DebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtLineItems_019e2c86-b84f-779b-948d-cd530c87626d" 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_019e2c86-b84f-7de7-855e-f5e9eed534f4" 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_019e2c86-b84f-779b-948d-cd530c87626d" xlink:to="loc_us-gaap_ScheduleOfShortTermDebtTable_019e2c86-b84f-7de7-855e-f5e9eed534f4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2c86-b84f-7563-8f5a-70b31323d7b0" 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_ScheduleOfShortTermDebtTable_019e2c86-b84f-7de7-855e-f5e9eed534f4" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2c86-b84f-7563-8f5a-70b31323d7b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2c86-b84f-7563-8f5a-70b31323d7b0_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_019e2c86-b84f-7563-8f5a-70b31323d7b0" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2c86-b84f-7563-8f5a-70b31323d7b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2c86-b84f-7ca7-a861-962ac71cccce" 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_019e2c86-b84f-7563-8f5a-70b31323d7b0" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2c86-b84f-7ca7-a861-962ac71cccce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2c86-b84f-70ee-a1c5-255aa3377ca1" 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_019e2c86-b84f-7ca7-a861-962ac71cccce" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2c86-b84f-70ee-a1c5-255aa3377ca1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2c86-b84f-7dd4-9258-3ac5554a81d2" 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_019e2c86-b84f-7de7-855e-f5e9eed534f4" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2c86-b84f-7dd4-9258-3ac5554a81d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2c86-b84f-7dd4-9258-3ac5554a81d2_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_019e2c86-b84f-7dd4-9258-3ac5554a81d2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2c86-b84f-7dd4-9258-3ac5554a81d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2c86-b84f-7fb0-8936-f6ded47b16ee" 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_019e2c86-b84f-7dd4-9258-3ac5554a81d2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2c86-b84f-7fb0-8936-f6ded47b16ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_CreditAgreementMember_019e2c86-b84f-7fa6-a300-b876c1eeee64" xlink:href="pgny-20260630.xsd#pgny_CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2c86-b84f-7fb0-8936-f6ded47b16ee" xlink:to="loc_pgny_CreditAgreementMember_019e2c86-b84f-7fa6-a300-b876c1eeee64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2c86-b84f-72da-915e-94b2c4b30dc0" 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_019e2c86-b84f-7de7-855e-f5e9eed534f4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2c86-b84f-72da-915e-94b2c4b30dc0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2c86-b84f-72da-915e-94b2c4b30dc0_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_019e2c86-b84f-72da-915e-94b2c4b30dc0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2c86-b84f-72da-915e-94b2c4b30dc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2c86-b84f-7cec-87cf-799c262d1f4f" 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_019e2c86-b84f-72da-915e-94b2c4b30dc0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2c86-b84f-7cec-87cf-799c262d1f4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e2c86-b84f-7202-8207-7c6e04caf9a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2c86-b84f-7cec-87cf-799c262d1f4f" xlink:to="loc_us-gaap_LineOfCreditMember_019e2c86-b84f-7202-8207-7c6e04caf9a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2c86-b84f-7dd0-a35a-efac05b6e3f5" 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_ShortTermDebtLineItems_019e2c86-b84f-779b-948d-cd530c87626d" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2c86-b84f-7dd0-a35a-efac05b6e3f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019e2c86-b84f-71ad-b66c-ebf48aed5690" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2c86-b84f-779b-948d-cd530c87626d" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019e2c86-b84f-71ad-b66c-ebf48aed5690" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaidInKindInterest_019e2c86-b84f-789c-9476-ef8367c77ac4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaidInKindInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2c86-b84f-779b-948d-cd530c87626d" xlink:to="loc_us-gaap_PaidInKindInterest_019e2c86-b84f-789c-9476-ef8367c77ac4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019f9a4e-aa93-76e2-843f-619e3133396b" 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_ShortTermDebtLineItems_019e2c86-b84f-779b-948d-cd530c87626d" xlink:to="loc_us-gaap_LineOfCredit_019f9a4e-aa93-76e2-843f-619e3133396b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/StockholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#StockholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7401-a253-1a83d0fc2634" 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_019e2c86-b84f-7c5c-821c-8dd65af948fb" 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_019e2c86-b84f-7401-a253-1a83d0fc2634" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2c86-b84f-7c5c-821c-8dd65af948fb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019e2c86-b84f-755a-91ad-14d80a368764" 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_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2c86-b84f-7c5c-821c-8dd65af948fb" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019e2c86-b84f-755a-91ad-14d80a368764" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019e2c86-b84f-755a-91ad-14d80a368764_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_019e2c86-b84f-755a-91ad-14d80a368764" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019e2c86-b84f-755a-91ad-14d80a368764_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019e2c86-b84f-7377-a171-0fb99df6ef8b" 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_019e2c86-b84f-755a-91ad-14d80a368764" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019e2c86-b84f-7377-a171-0fb99df6ef8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_ShareRepurchaseProgramMember_019eb526-f757-7281-a63f-e55114bfd80c" xlink:href="pgny-20260630.xsd#pgny_ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019e2c86-b84f-7377-a171-0fb99df6ef8b" xlink:to="loc_pgny_ShareRepurchaseProgramMember_019eb526-f757-7281-a63f-e55114bfd80c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_November2025ShareRepurchaseProgramMember_019eb534-9393-7973-a482-637f7709817a" xlink:href="pgny-20260630.xsd#pgny_November2025ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pgny_ShareRepurchaseProgramMember_019eb526-f757-7281-a63f-e55114bfd80c" xlink:to="loc_pgny_November2025ShareRepurchaseProgramMember_019eb534-9393-7973-a482-637f7709817a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_May2026ShareRepurchaseProgramMember_019eb521-5da2-70c9-b758-6356ffe6c4ba" xlink:href="pgny-20260630.xsd#pgny_May2026ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pgny_ShareRepurchaseProgramMember_019eb526-f757-7281-a63f-e55114bfd80c" xlink:to="loc_pgny_May2026ShareRepurchaseProgramMember_019eb521-5da2-70c9-b758-6356ffe6c4ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_019eb534-9393-7047-807a-ae915a6c7d6b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7401-a253-1a83d0fc2634" xlink:to="loc_srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_019eb534-9393-7047-807a-ae915a6c7d6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019e2c86-b84f-77ab-a96c-c7ca28176344" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7401-a253-1a83d0fc2634" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019e2c86-b84f-77ab-a96c-c7ca28176344" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019e2c86-b84f-77cf-9fca-988440188ab8" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7401-a253-1a83d0fc2634" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019e2c86-b84f-77cf-9fca-988440188ab8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019e2c86-b84f-7938-9e93-8c1baa362182" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7401-a253-1a83d0fc2634" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019e2c86-b84f-7938-9e93-8c1baa362182" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonValue_019e2c86-b84f-7725-8f6e-bd71de7b13aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7401-a253-1a83d0fc2634" xlink:to="loc_us-gaap_TreasuryStockCommonValue_019e2c86-b84f-7725-8f6e-bd71de7b13aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_StockRepurchaseDuringPeriodTradingFees_019faa61-570d-7497-9003-24dcd4c4424d" xlink:href="pgny-20260630.xsd#pgny_StockRepurchaseDuringPeriodTradingFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7401-a253-1a83d0fc2634" xlink:to="loc_pgny_StockRepurchaseDuringPeriodTradingFees_019faa61-570d-7497-9003-24dcd4c4424d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019e2c86-b84f-79d4-b46f-7b25e3c9bc7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7401-a253-1a83d0fc2634" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019e2c86-b84f-79d4-b46f-7b25e3c9bc7f" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/StockholdersEquityScheduleofStockBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#StockholdersEquityScheduleofStockBasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/StockholdersEquityScheduleofStockBasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7d7e-9f54-bb81a68037b6" 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_019e2c86-b84f-7d60-8dad-f0be835103f6" 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_019e2c86-b84f-7d7e-9f54-bb81a68037b6" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2c86-b84f-7d60-8dad-f0be835103f6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e2c86-b84f-7c37-991e-00b06daab72f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2c86-b84f-7d60-8dad-f0be835103f6" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e2c86-b84f-7c37-991e-00b06daab72f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract_019e2c86-b84f-796f-bc53-9b233f46ca7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7d7e-9f54-bb81a68037b6" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract_019e2c86-b84f-796f-bc53-9b233f46ca7b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2c86-b84f-7132-bdaf-021c77cf353b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract_019e2c86-b84f-796f-bc53-9b233f46ca7b" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2c86-b84f-7132-bdaf-021c77cf353b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/StockholdersEquityScheduleofStockBasedCompensationExpenseDetails_1" xlink:type="simple" xlink:href="pgny-20260630.xsd#StockholdersEquityScheduleofStockBasedCompensationExpenseDetails_1"/>
  <link:definitionLink xlink:role="http://progyny.com/role/StockholdersEquityScheduleofStockBasedCompensationExpenseDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7d7e-9f54-bb81a68037b6" 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_019e2c86-b84f-7d60-8dad-f0be835103f6" 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_019e2c86-b84f-7d7e-9f54-bb81a68037b6" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2c86-b84f-7d60-8dad-f0be835103f6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract_019e2c86-b84f-796f-bc53-9b233f46ca7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-7d7e-9f54-bb81a68037b6" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract_019e2c86-b84f-796f-bc53-9b233f46ca7b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2c86-b84f-7132-bdaf-021c77cf353b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract_019e2c86-b84f-796f-bc53-9b233f46ca7b" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2c86-b84f-7132-bdaf-021c77cf353b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/StockholdersEquityScheduleofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#StockholdersEquityScheduleofAccumulatedOtherComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/StockholdersEquityScheduleofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-76f3-b7ca-dea0d97787bd" 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_019e2c86-b84f-7f05-9c5c-311fd147a212" 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_019e2c86-b84f-76f3-b7ca-dea0d97787bd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2c86-b84f-7f05-9c5c-311fd147a212" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e2c86-b84f-79b7-801b-9ccdd1f49d62" 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_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2c86-b84f-7f05-9c5c-311fd147a212" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e2c86-b84f-79b7-801b-9ccdd1f49d62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2c86-b84f-79b7-801b-9ccdd1f49d62_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_019e2c86-b84f-79b7-801b-9ccdd1f49d62" xlink:to="loc_us-gaap_EquityComponentDomain_019e2c86-b84f-79b7-801b-9ccdd1f49d62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2c86-b84f-7d86-8b53-9bb653a8dcff" 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_019e2c86-b84f-79b7-801b-9ccdd1f49d62" xlink:to="loc_us-gaap_EquityComponentDomain_019e2c86-b84f-7d86-8b53-9bb653a8dcff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019e2c86-b84f-700c-9de5-08a5119a3dfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2c86-b84f-7d86-8b53-9bb653a8dcff" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019e2c86-b84f-700c-9de5-08a5119a3dfd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e2c86-b84f-7798-a417-e2683e45ff03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2c86-b84f-7d86-8b53-9bb653a8dcff" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e2c86-b84f-7798-a417-e2683e45ff03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2c86-b84f-7729-b7db-36a63cf52fcb" 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_019e2c86-b84f-7d86-8b53-9bb653a8dcff" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2c86-b84f-7729-b7db-36a63cf52fcb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019e2c86-b84f-7a3c-a5c4-cf72759754b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2c86-b84f-7f05-9c5c-311fd147a212" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019e2c86-b84f-7a3c-a5c4-cf72759754b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019e2c86-b84f-7a3c-a5c4-cf72759754b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019e2c86-b84f-7a3c-a5c4-cf72759754b0" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019e2c86-b84f-7a3c-a5c4-cf72759754b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019e2c86-b84f-7c35-838f-f5fa04a04028" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019e2c86-b84f-7a3c-a5c4-cf72759754b0" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019e2c86-b84f-7c35-838f-f5fa04a04028" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_019e2c86-b84f-7a19-98d1-ff00ac187809" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019e2c86-b84f-7c35-838f-f5fa04a04028" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_019e2c86-b84f-7a19-98d1-ff00ac187809" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e2c86-b84f-798f-9a4c-e4c3f4df3e62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-76f3-b7ca-dea0d97787bd" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e2c86-b84f-798f-9a4c-e4c3f4df3e62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2c86-b84f-756c-80e8-f63b1c8de336" 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_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e2c86-b84f-798f-9a4c-e4c3f4df3e62" xlink:to="loc_us-gaap_StockholdersEquity_019e2c86-b84f-756c-80e8-f63b1c8de336" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_019e2c86-b84f-702a-8424-fe87ba0e79b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e2c86-b84f-798f-9a4c-e4c3f4df3e62" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_019e2c86-b84f-702a-8424-fe87ba0e79b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_019e2c86-b84f-7e2d-938d-472a8e7936e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e2c86-b84f-798f-9a4c-e4c3f4df3e62" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_019e2c86-b84f-7e2d-938d-472a8e7936e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e2c86-b84f-7479-84ea-aba37979c59f" 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_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e2c86-b84f-798f-9a4c-e4c3f4df3e62" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e2c86-b84f-7479-84ea-aba37979c59f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2c86-b84f-796a-8113-5af838c94c5a" 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_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_019e2c86-b84f-78b4-9b2d-0ae99720e1d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-76f3-b7ca-dea0d97787bd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_019e2c86-b84f-78b4-9b2d-0ae99720e1d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_019e2c86-b84f-7b90-974d-9b6843ab69a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-76f3-b7ca-dea0d97787bd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_019e2c86-b84f-7b90-974d-9b6843ab69a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019e2c86-b84f-7e49-8d63-3dbd0e937d02" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-76f3-b7ca-dea0d97787bd" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019e2c86-b84f-7e49-8d63-3dbd0e937d02" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e2c86-b84f-7afe-a42d-d85c83dc1c8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-76f3-b7ca-dea0d97787bd" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e2c86-b84f-7afe-a42d-d85c83dc1c8b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e2c86-b84f-7b76-a220-d29b7f9b16ae" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-76f3-b7ca-dea0d97787bd" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e2c86-b84f-7b76-a220-d29b7f9b16ae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2c86-b84f-72f4-b97c-cf7978cf7c29" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2c86-b84f-76f3-b7ca-dea0d97787bd" xlink:to="loc_us-gaap_NetIncomeLoss_019e2c86-b84f-72f4-b97c-cf7978cf7c29" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/AcquisitionsDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#AcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/AcquisitionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019e2c86-b84f-7587-9735-f0426eaeb164" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionContingentConsiderationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_019e2c86-b84f-7fca-9646-35e83e8b9ac9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019e2c86-b84f-7587-9735-f0426eaeb164" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_019e2c86-b84f-7fca-9646-35e83e8b9ac9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019e2c86-b84f-7ce8-8c04-c068ad9e094e" 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_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_019e2c86-b84f-7fca-9646-35e83e8b9ac9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019e2c86-b84f-7ce8-8c04-c068ad9e094e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2c86-b84f-7ce8-8c04-c068ad9e094e_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_019e2c86-b84f-7ce8-8c04-c068ad9e094e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2c86-b84f-7ce8-8c04-c068ad9e094e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2c86-b84f-71cd-aca2-0c6bc02e52e1" 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_019e2c86-b84f-7ce8-8c04-c068ad9e094e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2c86-b84f-71cd-aca2-0c6bc02e52e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_BenefitBumpLLCMember_019e2c86-b84f-778a-a93a-1b1c045f3ffb" xlink:href="pgny-20260630.xsd#pgny_BenefitBumpLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2c86-b84f-71cd-aca2-0c6bc02e52e1" xlink:to="loc_pgny_BenefitBumpLLCMember_019e2c86-b84f-778a-a93a-1b1c045f3ffb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019e2c86-b84f-728c-a8f5-5753ef7fb125" 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_BusinessAcquisitionContingentConsiderationLineItems_019e2c86-b84f-7587-9735-f0426eaeb164" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019e2c86-b84f-728c-a8f5-5753ef7fb125" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EscrowDepositDisbursementsRelatedToPropertyAcquisition1_019e2c86-b84f-75c2-96a0-470ae35e9354" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EscrowDepositDisbursementsRelatedToPropertyAcquisition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_019e2c86-b84f-7587-9735-f0426eaeb164" xlink:to="loc_us-gaap_EscrowDepositDisbursementsRelatedToPropertyAcquisition1_019e2c86-b84f-75c2-96a0-470ae35e9354" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/NetIncomePerShareScheduleofReconciliationofNetIncomeandNumberofSharesintheCalculationofBasicandDilutedNetIncomeperShareDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#NetIncomePerShareScheduleofReconciliationofNetIncomeandNumberofSharesintheCalculationofBasicandDilutedNetIncomeperShareDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/NetIncomePerShareScheduleofReconciliationofNetIncomeandNumberofSharesintheCalculationofBasicandDilutedNetIncomeperShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2c86-b84f-7658-b2e5-abb68edb460b" 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_019e2c86-b84f-7d92-82dc-2a8e322e173b" 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_019e2c86-b84f-7658-b2e5-abb68edb460b" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2c86-b84f-7d92-82dc-2a8e322e173b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2c86-b84f-76c8-a3a8-12489fd8b793" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2c86-b84f-7d92-82dc-2a8e322e173b" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2c86-b84f-76c8-a3a8-12489fd8b793" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-76c8-a3a8-12489fd8b793_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2c86-b84f-76c8-a3a8-12489fd8b793" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-76c8-a3a8-12489fd8b793_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7ddc-9cea-c06774a8504a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2c86-b84f-76c8-a3a8-12489fd8b793" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7ddc-9cea-c06774a8504a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019e2c86-b84f-7328-8afa-9363f47bc27a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7ddc-9cea-c06774a8504a" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019e2c86-b84f-7328-8afa-9363f47bc27a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019e2c86-b84f-7dac-9b17-16a9dff4d01a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7ddc-9cea-c06774a8504a" xlink:to="loc_us-gaap_EmployeeStockMember_019e2c86-b84f-7dac-9b17-16a9dff4d01a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019e2c86-b84f-7a0a-9b7d-58530c15df3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7ddc-9cea-c06774a8504a" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019e2c86-b84f-7a0a-9b7d-58530c15df3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_019e2c86-b84f-774d-a430-01faaf4ebfed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2c86-b84f-7658-b2e5-abb68edb460b" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_019e2c86-b84f-774d-a430-01faaf4ebfed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e2c86-b84f-7cad-b591-d8183b169d08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_019e2c86-b84f-774d-a430-01faaf4ebfed" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e2c86-b84f-7cad-b591-d8183b169d08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_019e2c86-b84f-76dc-ac41-760cb2a4cb5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2c86-b84f-7658-b2e5-abb68edb460b" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_019e2c86-b84f-76dc-ac41-760cb2a4cb5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e2c86-b84f-7e40-b6fc-f61234143712" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_019e2c86-b84f-76dc-ac41-760cb2a4cb5b" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e2c86-b84f-7e40-b6fc-f61234143712" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019e2c86-b84f-7681-aa1c-f7dcc4624acd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_019e2c86-b84f-76dc-ac41-760cb2a4cb5b" xlink:to="loc_us-gaap_EarningsPerShareBasic_019e2c86-b84f-7681-aa1c-f7dcc4624acd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_019e2c86-b84f-70a6-9a13-c5217356c30b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2c86-b84f-7658-b2e5-abb68edb460b" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_019e2c86-b84f-70a6-9a13-c5217356c30b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019e2c86-b84f-74a3-98fd-539d016c1fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_019e2c86-b84f-70a6-9a13-c5217356c30b" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019e2c86-b84f-74a3-98fd-539d016c1fb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019e2c86-b84f-7c26-90c6-da9ad009b102" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2c86-b84f-7658-b2e5-abb68edb460b" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019e2c86-b84f-7c26-90c6-da9ad009b102" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e2c86-b84f-717b-bb7a-120f2d178acc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019e2c86-b84f-750b-90ae-7afd5da7ab14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019e2c86-b84f-7c26-90c6-da9ad009b102" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019e2c86-b84f-750b-90ae-7afd5da7ab14" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e2c86-b84f-7cab-81a7-3194f2ca91c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019e2c86-b84f-7c26-90c6-da9ad009b102" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e2c86-b84f-7cab-81a7-3194f2ca91c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019e2c86-b84f-7c49-bae6-fd6fd2efe14f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019e2c86-b84f-7c26-90c6-da9ad009b102" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019e2c86-b84f-7c49-bae6-fd6fd2efe14f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/NetIncomePerShareScheduleofPotentiallyDilutiveSecuritiesDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#NetIncomePerShareScheduleofPotentiallyDilutiveSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/NetIncomePerShareScheduleofPotentiallyDilutiveSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2c86-b84f-71b2-8795-b25db1537cc3" 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_019e2c86-b84f-7fc4-ad49-676e47c12f06" 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_019e2c86-b84f-71b2-8795-b25db1537cc3" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2c86-b84f-7fc4-ad49-676e47c12f06" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2c86-b84f-7e2f-b70f-ac781d757619" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2c86-b84f-7fc4-ad49-676e47c12f06" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2c86-b84f-7e2f-b70f-ac781d757619" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7e2f-b70f-ac781d757619_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2c86-b84f-7e2f-b70f-ac781d757619" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7e2f-b70f-ac781d757619_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7abf-82cb-7e3cdc9e4084" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2c86-b84f-7e2f-b70f-ac781d757619" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7abf-82cb-7e3cdc9e4084" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019e2c86-b84f-7075-bba5-728a287a857d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7abf-82cb-7e3cdc9e4084" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019e2c86-b84f-7075-bba5-728a287a857d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019e2c86-b84f-7c67-a020-382d992fb2f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7abf-82cb-7e3cdc9e4084" xlink:to="loc_us-gaap_EmployeeStockMember_019e2c86-b84f-7c67-a020-382d992fb2f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019e2c86-b84f-7528-b1de-0e1eee708e0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2c86-b84f-7abf-82cb-7e3cdc9e4084" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019e2c86-b84f-7528-b1de-0e1eee708e0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e2c86-b84f-7610-b12b-334fe3d32936" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2c86-b84f-71b2-8795-b25db1537cc3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e2c86-b84f-7610-b12b-334fe3d32936" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://progyny.com/role/SegmentsScheduleofNetIncometoAllocateResourceDetails" xlink:type="simple" xlink:href="pgny-20260630.xsd#SegmentsScheduleofNetIncometoAllocateResourceDetails"/>
  <link:definitionLink xlink:role="http://progyny.com/role/SegmentsScheduleofNetIncometoAllocateResourceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e2c86-b84f-7b3c-b235-2081ff35093a" 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_019e2c86-b84f-78dd-9d46-d5ee9a9718d6" 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_019e2c86-b84f-7b3c-b235-2081ff35093a" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2c86-b84f-78dd-9d46-d5ee9a9718d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e2c86-b84f-7b81-b772-0772706c6332" 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_019e2c86-b84f-78dd-9d46-d5ee9a9718d6" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e2c86-b84f-7b81-b772-0772706c6332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e2c86-b84f-7b81-b772-0772706c6332_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_019e2c86-b84f-7b81-b772-0772706c6332" xlink:to="loc_us-gaap_SegmentDomain_019e2c86-b84f-7b81-b772-0772706c6332_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e2c86-b84f-7132-b40d-5bf8a2f844fe" 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_019e2c86-b84f-7b81-b772-0772706c6332" xlink:to="loc_us-gaap_SegmentDomain_019e2c86-b84f-7132-b40d-5bf8a2f844fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_ReportableSegmentMember_019e2c86-b84f-7631-aaf9-e1eb23452eb5" xlink:href="pgny-20260630.xsd#pgny_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e2c86-b84f-7132-b40d-5bf8a2f844fe" xlink:to="loc_pgny_ReportableSegmentMember_019e2c86-b84f-7631-aaf9-e1eb23452eb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2c86-b84f-775a-992f-acac9f4e735d" 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_019e2c86-b84f-7b3c-b235-2081ff35093a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2c86-b84f-775a-992f-acac9f4e735d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019e2c86-b84f-75e7-aa53-07030c466392" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2c86-b84f-7b3c-b235-2081ff35093a" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019e2c86-b84f-75e7-aa53-07030c466392" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_SalesAndMarketing_019e2c86-b84f-7ccb-ab8a-0c795c4cd934" xlink:href="pgny-20260630.xsd#pgny_SalesAndMarketing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2c86-b84f-7b3c-b235-2081ff35093a" xlink:to="loc_pgny_SalesAndMarketing_019e2c86-b84f-7ccb-ab8a-0c795c4cd934" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019e2c86-b84f-7a91-9a50-91c818017e8c" 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_SegmentReportingInformationLineItems_019e2c86-b84f-7b3c-b235-2081ff35093a" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019e2c86-b84f-7a91-9a50-91c818017e8c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOther_019e2c86-b84f-7ebe-aa5b-89def50a7021" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2c86-b84f-7b3c-b235-2081ff35093a" xlink:to="loc_us-gaap_InterestIncomeOther_019e2c86-b84f-7ebe-aa5b-89def50a7021" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e2c86-b84f-7bf4-804f-07d306a983aa" 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_SegmentReportingInformationLineItems_019e2c86-b84f-7b3c-b235-2081ff35093a" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e2c86-b84f-7bf4-804f-07d306a983aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019e2c86-b84f-7600-af9a-6b32eb042da2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2c86-b84f-7b3c-b235-2081ff35093a" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019e2c86-b84f-7600-af9a-6b32eb042da2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e2c86-b84f-70ba-9b1b-0840cca97e91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2c86-b84f-7b3c-b235-2081ff35093a" xlink:to="loc_us-gaap_Assets_019e2c86-b84f-70ba-9b1b-0840cca97e91" xlink:type="arc" order="7"/>
  </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_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_AccruedLiabilitiesAndOtherLiabilitiesCurrent_019e2c86-b775-7481-9e67-a179f3d4f859" xlink:href="pgny-20260630.xsd#pgny_AccruedLiabilitiesAndOtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_pgny_AccruedLiabilitiesAndOtherLiabilitiesCurrent_019e2c86-b775-7481-9e67-a179f3d4f859" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccountsPayableCurrent" xlink:type="arc" order="42"/>
  </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_pgny_MarkLivingstonMember_019e2c86-b775-7fd1-89d1-c1764be841ea" xlink:href="pgny-20260630.xsd#pgny_MarkLivingstonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_pgny_MarkLivingstonMember_019e2c86-b775-7fd1-89d1-c1764be841ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_AllisonSwartzMember_019e2c86-b775-7f81-a23e-e72317460782" xlink:href="pgny-20260630.xsd#pgny_AllisonSwartzMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_pgny_AllisonSwartzMember_019e2c86-b775-7f81-a23e-e72317460782" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_PeteAnevskiMember_019fd581-0cf4-791b-be0d-be5e0487328b" xlink:href="pgny-20260630.xsd#pgny_PeteAnevskiMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_pgny_PeteAnevskiMember_019fd581-0cf4-791b-be0d-be5e0487328b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pgny_DavidSchlangerMember_019fd581-4a88-75f2-9053-f5f22c9f5cfd" xlink:href="pgny-20260630.xsd#pgny_DavidSchlangerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_pgny_DavidSchlangerMember_019fd581-4a88-75f2-9053-f5f22c9f5cfd" xlink:type="arc" order="5"/>
  </link:definitionLink>
</link:linkbase>
