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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a19d44-6367-72d4-a585-d084cd776fc5,g:d04809c6-13ae-4b54-bc6b-22c52d25c79d-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.penguinsolutions.com/role/Cover" xlink:type="simple" xlink:href="peng-20261103.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.penguinsolutions.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesLineItems_01a19d44-6367-71f4-bb5a-9e4b2fb4e34e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesTable_01a19d44-6367-726d-9f0b-4512b04b94f6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityAddressesLineItems_01a19d44-6367-71f4-bb5a-9e4b2fb4e34e" xlink:to="loc_dei_EntityAddressesTable_01a19d44-6367-726d-9f0b-4512b04b94f6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_01a19d44-6367-734b-83ab-29b9228de551" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressesAddressTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityAddressesTable_01a19d44-6367-726d-9f0b-4512b04b94f6" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_01a19d44-6367-734b-83ab-29b9228de551" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_01a19d44-6367-734b-83ab-29b9228de551_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_01a19d44-6367-734b-83ab-29b9228de551" xlink:to="loc_dei_AddressTypeDomain_01a19d44-6367-734b-83ab-29b9228de551_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_01a19d44-6367-7113-b8ab-b5bd98c99093" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_01a19d44-6367-734b-83ab-29b9228de551" xlink:to="loc_dei_AddressTypeDomain_01a19d44-6367-7113-b8ab-b5bd98c99093" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_FormerAddressMember_01a19d44-6367-7420-872a-5846e1138825" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_FormerAddressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AddressTypeDomain_01a19d44-6367-7113-b8ab-b5bd98c99093" xlink:to="loc_dei_FormerAddressMember_01a19d44-6367-7420-872a-5846e1138825" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_01a19d44-6367-77f7-8e65-aaa22faf8f4a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_01a19d44-6367-71f4-bb5a-9e4b2fb4e34e" xlink:to="loc_dei_EntityAddressCityOrTown_01a19d44-6367-77f7-8e65-aaa22faf8f4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_01a19d44-6367-79ea-bee2-849eb1ad55e9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_01a19d44-6367-71f4-bb5a-9e4b2fb4e34e" xlink:to="loc_dei_EntityAddressStateOrProvince_01a19d44-6367-79ea-bee2-849eb1ad55e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_01a19d44-6367-797c-975a-b3403ebe6172" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_01a19d44-6367-71f4-bb5a-9e4b2fb4e34e" xlink:to="loc_dei_EntityAddressAddressLine1_01a19d44-6367-797c-975a-b3403ebe6172" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a19d44-6367-79fe-b200-4cd6d514bac7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_01a19d44-6367-71f4-bb5a-9e4b2fb4e34e" xlink:to="loc_dei_DocumentPeriodEndDate_01a19d44-6367-79fe-b200-4cd6d514bac7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_01a19d6a-74ca-787c-b3c0-77011d9d9e34" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_01a19d6a-74ca-77bb-b5b7-49fd07b81497" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_01a19d6a-74ca-787c-b3c0-77011d9d9e34" xlink:to="loc_dei_DocumentInformationTable_01a19d6a-74ca-77bb-b5b7-49fd07b81497" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_01a19d6a-74ca-7273-9cdc-801ed2ee2a08" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a19d6a-74ca-787c-b3c0-77011d9d9e34" xlink:to="loc_dei_DocumentType_01a19d6a-74ca-7273-9cdc-801ed2ee2a08" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
