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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a10e7e-20b2-7c0a-911c-31be974f450b,g:b791ae92-f7ab-4847-8822-88cb58e333a5-->
<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.us.aviatnetworks.com/role/Cover" xlink:type="simple" xlink:href="avnw-20261005.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsLineItems_01a10e7e-20b2-7097-81da-1efb4d4030c9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityListingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsTable_01a10e7e-20b2-7e6e-a67d-0fe32ec748b7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityListingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityListingsLineItems_01a10e7e-20b2-7097-81da-1efb4d4030c9" xlink:to="loc_dei_EntityListingsTable_01a10e7e-20b2-7e6e-a67d-0fe32ec748b7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_01a10e7e-20b2-75a3-98f4-7213994e13a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityListingsTable_01a10e7e-20b2-7e6e-a67d-0fe32ec748b7" xlink:to="loc_us-gaap_StatementClassOfStockAxis_01a10e7e-20b2-75a3-98f4-7213994e13a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a10e7e-20b2-75a3-98f4-7213994e13a9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a10e7e-20b2-75a3-98f4-7213994e13a9" xlink:to="loc_us-gaap_ClassOfStockDomain_01a10e7e-20b2-75a3-98f4-7213994e13a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a10e7e-20b2-73e4-b2a2-e78d975cee3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a10e7e-20b2-75a3-98f4-7213994e13a9" xlink:to="loc_us-gaap_ClassOfStockDomain_01a10e7e-20b2-73e4-b2a2-e78d975cee3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a10e7e-20b2-7f63-bcb4-bd736d185633" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a10e7e-20b2-73e4-b2a2-e78d975cee3b" xlink:to="loc_us-gaap_CommonStockMember_01a10e7e-20b2-7f63-bcb4-bd736d185633" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_01a10e7e-20b2-72fc-b2f7-a3f50ecbd7f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a10e7e-20b2-73e4-b2a2-e78d975cee3b" xlink:to="loc_us-gaap_PreferredStockMember_01a10e7e-20b2-72fc-b2f7-a3f50ecbd7f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_01a10e7e-20b2-7b44-b526-90afd9bb0225" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_01a10e7e-20b2-7097-81da-1efb4d4030c9" xlink:to="loc_dei_Security12bTitle_01a10e7e-20b2-7b44-b526-90afd9bb0225" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_01a10e7e-20b2-7e45-9405-2273879e2969" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_01a10e7e-20b2-7097-81da-1efb4d4030c9" xlink:to="loc_dei_TradingSymbol_01a10e7e-20b2-7e45-9405-2273879e2969" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_01a10e7e-20b2-7d41-a4a1-fbf2fd3ee2b0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_01a10e7e-20b2-7097-81da-1efb4d4030c9" xlink:to="loc_dei_SecurityExchangeName_01a10e7e-20b2-7d41-a4a1-fbf2fd3ee2b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_NoTradingSymbolFlag_01a10e7e-20b2-71a1-b7a0-0de8f008a7b9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_NoTradingSymbolFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_01a10e7e-20b2-7097-81da-1efb4d4030c9" xlink:to="loc_dei_NoTradingSymbolFlag_01a10e7e-20b2-71a1-b7a0-0de8f008a7b9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a10e7e-20b2-7267-9445-2b872588a9fb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_01a10e7e-20b2-7097-81da-1efb4d4030c9" xlink:to="loc_dei_DocumentPeriodEndDate_01a10e7e-20b2-7267-9445-2b872588a9fb" xlink:type="arc" order="4"/>
  </link:definitionLink>
</link:linkbase>
