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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019f801e-1068-7eb5-9d95-2b5706d0796f,g:88e3e393-79f3-4e2e-a48d-787da0812877-->
<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.nauticusrobotics.com/role/Cover" xlink:type="simple" xlink:href="kitt-20260720.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.nauticusrobotics.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019f801e-1068-7fe7-a287-af094b4316d2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_DocumentInformationTable_019f801e-1068-7fe7-a287-af094b4316d2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019f801e-1068-7d46-bd09-2e67a23b6a1d" 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_DocumentInformationTable_019f801e-1068-7fe7-a287-af094b4316d2" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019f801e-1068-7d46-bd09-2e67a23b6a1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f801e-1068-7d46-bd09-2e67a23b6a1d_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_019f801e-1068-7d46-bd09-2e67a23b6a1d" xlink:to="loc_us-gaap_ClassOfStockDomain_019f801e-1068-7d46-bd09-2e67a23b6a1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f801e-1068-76dc-9c3a-97c97ede4347" 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_019f801e-1068-7d46-bd09-2e67a23b6a1d" xlink:to="loc_us-gaap_ClassOfStockDomain_019f801e-1068-76dc-9c3a-97c97ede4347" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019f801e-1068-798d-b1c6-4f3c7be944d9" 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_019f801e-1068-76dc-9c3a-97c97ede4347" xlink:to="loc_us-gaap_CommonStockMember_019f801e-1068-798d-b1c6-4f3c7be944d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_019f801e-1068-7661-83e9-4312e5490c8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f801e-1068-76dc-9c3a-97c97ede4347" xlink:to="loc_us-gaap_WarrantMember_019f801e-1068-7661-83e9-4312e5490c8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019f801e-1068-7ca6-ba8c-e03e4d9baab2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_DocumentType_019f801e-1068-7ca6-ba8c-e03e4d9baab2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019f801e-1068-71b4-9583-33bf96658e9f" 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_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_DocumentPeriodEndDate_019f801e-1068-71b4-9583-33bf96658e9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019f801e-1068-7018-b642-4e38aab29240" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityRegistrantName_019f801e-1068-7018-b642-4e38aab29240" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019f801e-1068-737f-9aa1-19c839e123ad" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019f801e-1068-737f-9aa1-19c839e123ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019f801e-1068-77df-a524-53669c52f886" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityFileNumber_019f801e-1068-77df-a524-53669c52f886" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019f801e-1068-7da6-a429-8f25dcb94f13" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityTaxIdentificationNumber_019f801e-1068-7da6-a429-8f25dcb94f13" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019f801e-1068-7042-b892-d6fd22965c48" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityAddressAddressLine1_019f801e-1068-7042-b892-d6fd22965c48" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019f801e-1068-7d69-b004-12f0664f52b9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityAddressAddressLine2_019f801e-1068-7d69-b004-12f0664f52b9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019f801e-1068-7cd7-8b29-3b13d7a4e24f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityAddressCityOrTown_019f801e-1068-7cd7-8b29-3b13d7a4e24f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019f801e-1068-7df8-9f58-a9938d69403b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityAddressStateOrProvince_019f801e-1068-7df8-9f58-a9938d69403b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019f801e-1068-7f9a-84fe-4f0dda755ca3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityAddressPostalZipCode_019f801e-1068-7f9a-84fe-4f0dda755ca3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019f801e-1068-7230-af39-1a5b9a76e77f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_CityAreaCode_019f801e-1068-7230-af39-1a5b9a76e77f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019f801e-1068-7bff-b2a8-ebbd3e2e7213" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_LocalPhoneNumber_019f801e-1068-7bff-b2a8-ebbd3e2e7213" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019f801e-1068-72cd-8a36-6bfbe21a0aae" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_WrittenCommunications_019f801e-1068-72cd-8a36-6bfbe21a0aae" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019f801e-1068-77ae-89bf-8be1329d47bc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_SolicitingMaterial_019f801e-1068-77ae-89bf-8be1329d47bc" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019f801e-1068-7903-92dd-67a9f50c239c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_PreCommencementTenderOffer_019f801e-1068-7903-92dd-67a9f50c239c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019f801e-1068-7aae-a81e-37b890e52ad3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019f801e-1068-7aae-a81e-37b890e52ad3" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019f801e-1068-7d4a-be85-79f6982d0c47" 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_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_Security12bTitle_019f801e-1068-7d4a-be85-79f6982d0c47" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019f801e-1068-7f8f-83f0-0b319db25cd4" 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_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_TradingSymbol_019f801e-1068-7f8f-83f0-0b319db25cd4" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019f801e-1068-7d1d-8de7-1cc6c0d71997" 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_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_SecurityExchangeName_019f801e-1068-7d1d-8de7-1cc6c0d71997" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019f801e-1068-7eb4-b956-74e2253e06f2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityEmergingGrowthCompany_019f801e-1068-7eb4-b956-74e2253e06f2" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityExTransitionPeriod_019f801e-1068-7a7b-b55d-89d7810ebf43" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityExTransitionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityExTransitionPeriod_019f801e-1068-7a7b-b55d-89d7810ebf43" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019f801e-1068-7c5b-9f6c-8ca9643e9584" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_AmendmentFlag_019f801e-1068-7c5b-9f6c-8ca9643e9584" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019f801e-1068-7b96-812a-7f2a6c30aba5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f801e-1068-77ef-82c2-b0b4dac2f938" xlink:to="loc_dei_EntityCentralIndexKey_019f801e-1068-7b96-812a-7f2a6c30aba5" xlink:type="arc" order="23"/>
  </link:definitionLink>
</link:linkbase>
