content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
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      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001566391</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
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      <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>10507</noOfUnitsSold>
        <aggregateMarketValue>658158.48</aggregateMarketValue>
        <noOfUnitsOutstanding>291989568</noOfUnitsOutstanding>
        <approxSaleDate>11/17/2023</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/17/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Option Granted - 02/13/2014</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>10507</amountOfSecuritiesAcquired>
        <paymentDate>11/17/2023</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>09/27/2023</saleDate>
        <amountOfSecuritiesSold>10507</amountOfSecuritiesSold>
        <grossProceeds>631050.42</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>09/28/2023</saleDate>
        <amountOfSecuritiesSold>10507</amountOfSecuritiesSold>
        <grossProceeds>620753.56</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>10/04/2023</saleDate>
        <amountOfSecuritiesSold>10507</amountOfSecuritiesSold>
        <grossProceeds>603837.29</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>10/05/2023</saleDate>
        <amountOfSecuritiesSold>10507</amountOfSecuritiesSold>
        <grossProceeds>606043.76</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>11/16/2023</saleDate>
        <amountOfSecuritiesSold>10507</amountOfSecuritiesSold>
        <grossProceeds>653955.68</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>11/17/2023</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>05/13/2022</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for William L. Meaney</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 6286}]
text: 144
  0001566391
  XXXXXXXX
  LIVE
  0001020569
  IRON MOUNTAIN INC
  001-13045
  85 NEW HAMPSHIRE AVENUE, SUITE 150
  PEASE INTERNATIONAL TRADEPORT
  PORTSMOUTH
  NH
  03801
  617-535-4781
  Meaney William L
  Officer
  Director
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  10507
  658158.48
  291989568
  11/17/2023
  NYSE
  Common
  11/17/2023
  Option Granted - 02/13/2014
  Issuer
  N
  10507
  11/17/2023
  Cash
  N
  William L. Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  09/27/2023
  10507
  631050.42
  William L. Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  09/28/2023
  10507
  620753.56
  William L. Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  10/04/2023
  10507
  603837.29
  William L. Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  10/05/2023
  10507
  606043.76
  William L. Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  11/16/2023
  10507
  653955.68
  11/17/2023
  05/13/2022
  /s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for William L. Meaney