<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001651579</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001660280</issuerCik>
      <issuerName>Tenable Holdings, Inc.</issuerName>
      <secFileNumber>001-38600</secFileNumber>
      <issuerAddress>
        <com:street1>6100 MERRIWEATHER DRIVE</com:street1>
        <com:city>COLUMBIA</com:city>
        <com:stateOrCountry>MD</com:stateOrCountry>
        <com:zipCode>21044</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>410-872-0555</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Thurmond Mark C.</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Fidelity Brokerage Services LLC</name>
        <address>
          <com:street1>900 Salem Street</com:street1>
          <com:city>Smithfield</com:city>
          <com:stateOrCountry>RI</com:stateOrCountry>
          <com:zipCode>02917</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>951</noOfUnitsSold>
      <aggregateMarketValue>39019.53</aggregateMarketValue>
      <noOfUnitsOutstanding>119110431</noOfUnitsOutstanding>
      <approxSaleDate>08/27/2024</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>08/23/2024</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>951</amountOfSecuritiesAcquired>
      <paymentDate>08/23/2024</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark C. Thurmond</name>
        <address>
          <com:street1>6100 Merriweather Drive</com:street1>
          <com:city>Columbia</com:city>
          <com:stateOrCountry>MD</com:stateOrCountry>
          <com:zipCode>21044</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>05/28/2024</saleDate>
      <amountOfSecuritiesSold>949</amountOfSecuritiesSold>
      <grossProceeds>41727.53</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark C. Thurmond</name>
        <address>
          <com:street1>6100 Merriweather Drive</com:street1>
          <com:city>Columbia</com:city>
          <com:stateOrCountry>MD</com:stateOrCountry>
          <com:zipCode>21044</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>07/30/2024</saleDate>
      <amountOfSecuritiesSold>4700</amountOfSecuritiesSold>
      <grossProceeds>230328.62</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark C. Thurmond</name>
        <address>
          <com:street1>6100 Merriweather Drive</com:street1>
          <com:city>Columbia</com:city>
          <com:stateOrCountry>MD</com:stateOrCountry>
          <com:zipCode>21044</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>08/20/2024</saleDate>
      <amountOfSecuritiesSold>2224</amountOfSecuritiesSold>
      <grossProceeds>94198.41</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark C. Thurmond</name>
        <address>
          <com:street1>6100 Merriweather Drive</com:street1>
          <com:city>Columbia</com:city>
          <com:stateOrCountry>MD</com:stateOrCountry>
          <com:zipCode>21044</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>08/21/2024</saleDate>
      <amountOfSecuritiesSold>818</amountOfSecuritiesSold>
      <grossProceeds>34495.06</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark C. Thurmond</name>
        <address>
          <com:street1>6100 Merriweather Drive</com:street1>
          <com:city>Columbia</com:city>
          <com:stateOrCountry>MD</com:stateOrCountry>
          <com:zipCode>21044</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>08/23/2024</saleDate>
      <amountOfSecuritiesSold>2327</amountOfSecuritiesSold>
      <grossProceeds>97914.02</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark C. Thurmond</name>
        <address>
          <com:street1>6100 Merriweather Drive</com:street1>
          <com:city>Columbia</com:city>
          <com:stateOrCountry>MD</com:stateOrCountry>
          <com:zipCode>21044</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>08/26/2024</saleDate>
      <amountOfSecuritiesSold>3383</amountOfSecuritiesSold>
      <grossProceeds>140913.08</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>08/27/2024</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>05/24/2023</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark C Thurmond </signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
