<?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>0001566391</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001020569</issuerCik>
      <issuerName>IRON MOUNTAIN INC</issuerName>
      <secFileNumber>001-13045</secFileNumber>
      <issuerAddress>
        <com:street1>85 NEW HAMPSHIRE AVENUE, SUITE 150</com:street1>
        <com:street2>PEASE INTERNATIONAL TRADEPORT</com:street2>
        <com:city>PORTSMOUTH</com:city>
        <com:stateOrCountry>NH</com:stateOrCountry>
        <com:zipCode>03801</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>617-535-4781</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Meaney William L</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
        <relationshipToIssuer>Director</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>38474</noOfUnitsSold>
      <aggregateMarketValue>4874655.80</aggregateMarketValue>
      <noOfUnitsOutstanding>297524681</noOfUnitsOutstanding>
      <approxSaleDate>06/01/2026</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/01/2026</acquiredDate>
      <natureOfAcquisitionTransaction>Option Granted - 02/16/2017</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>38474</amountOfSecuritiesAcquired>
      <paymentDate>06/01/2026</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>William L. Meaney</name>
        <address>
          <com:street1>85 New Hampshire Avenue</com:street1>
          <com:street2>Suite 150</com:street2>
          <com:city>Portsmouth</com:city>
          <com:stateOrCountry>NH</com:stateOrCountry>
          <com:zipCode>03801</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/02/2026</saleDate>
      <amountOfSecuritiesSold>137133</amountOfSecuritiesSold>
      <grossProceeds>15001556.50</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>William L. Meaney</name>
        <address>
          <com:street1>85 New Hampshire Avenue</com:street1>
          <com:street2>Suite 150</com:street2>
          <com:city>Portsmouth</com:city>
          <com:stateOrCountry>NH</com:stateOrCountry>
          <com:zipCode>03801</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/03/2026</saleDate>
      <amountOfSecuritiesSold>98659</amountOfSecuritiesSold>
      <grossProceeds>10540534.39</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>William L. Meaney</name>
        <address>
          <com:street1>85 New Hampshire Avenue, Suite 150</com:street1>
          <com:city>Portsmouth</com:city>
          <com:stateOrCountry>NH</com:stateOrCountry>
          <com:zipCode>03801</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/04/2026</saleDate>
      <amountOfSecuritiesSold>98659</amountOfSecuritiesSold>
      <grossProceeds>10592474.23</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>William L. Meaney</name>
        <address>
          <com:street1>85 New Hampshire Avenue, Suite 150</com:street1>
          <com:city>Portsmouth</com:city>
          <com:stateOrCountry>NH</com:stateOrCountry>
          <com:zipCode>03801</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/05/2026</saleDate>
      <amountOfSecuritiesSold>98657</amountOfSecuritiesSold>
      <grossProceeds>10482170.39</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>William L. Meaney</name>
        <address>
          <com:street1>85 New Hampshire Avenue</com:street1>
          <com:street2>Suite 150</com:street2>
          <com:city>Portsmouth</com:city>
          <com:stateOrCountry>NH</com:stateOrCountry>
          <com:zipCode>03801</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>04/01/2026</saleDate>
      <amountOfSecuritiesSold>38474</amountOfSecuritiesSold>
      <grossProceeds>3951664.54</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>William L. Meaney</name>
        <address>
          <com:street1>85 New Hampshire Avenue</com:street1>
          <com:street2>Suite 150</com:street2>
          <com:city>Portsmouth</com:city>
          <com:stateOrCountry>NH</com:stateOrCountry>
          <com:zipCode>03801</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>05/08/2026</saleDate>
      <amountOfSecuritiesSold>38474</amountOfSecuritiesSold>
      <grossProceeds>4960368.18</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>06/01/2026</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>03/13/2025</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for William L. Meaney</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
