<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001903980</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001561550</issuerCik>
            <issuerName>Datadog, Inc.</issuerName>
            <secFileNumber>001-39051</secFileNumber>
            <issuerAddress>
                <ns2:street1>620 8th Avenue</ns2:street1>
                <ns2:city>New York</ns2:city>
                <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                <ns2:zipCode>10018</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>8663294466</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>SEAN MICHAEL WALTERS</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Class A Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>9468</noOfUnitsSold>
            <aggregateMarketValue>1154433.24</aggregateMarketValue>
            <noOfUnitsOutstanding>319498060</noOfUnitsOutstanding>
            <approxSaleDate>06/17/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/01/2025</acquiredDate>
            <natureOfAcquisitionTransaction>RSU/PSU</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>9468</amountOfSecuritiesAcquired>
            <paymentDate>03/01/2025</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for SEAN MICHAEL WALTERS</name>
                <address>
                    <ns2:street1>620 8th Avenue</ns2:street1>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Class A Common</securitiesClassTitle>
            <saleDate>06/11/2025</saleDate>
            <amountOfSecuritiesSold>4170</amountOfSecuritiesSold>
            <grossProceeds>498268.30</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>SEAN MICHAEL WALTERS</name>
                <address>
                    <ns2:street1>620 8th Avenue</ns2:street1>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Class A Common</securitiesClassTitle>
            <saleDate>06/02/2025</saleDate>
            <amountOfSecuritiesSold>11167</amountOfSecuritiesSold>
            <grossProceeds>1293841.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>Securities to be sold, acquired through RSU/PSU or upon option exercise, were registered on Form S-8. The securities to be sold were acquired upon the vesting of restricted and performance stock units during the period of 3/1/2025 through 6/1/2025. </remarks>
        <noticeSignature>
            <noticeDate>06/17/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>12/10/2024</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Sean Michael Walters</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4990}]
144
0001903980
XXXXXXXX
LIVE
0001561550
Datadog, Inc.
001-39051
620 8th Avenue
New York
NY
10018
8663294466
SEAN MICHAEL WALTERS
Officer
Class A Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
9468
1154433.24
319498060
06/17/2025
NASDAQ
Common
03/01/2025
RSU/PSU
Issuer
N
9468
03/01/2025
N/A
N
10b5-1 Sales for SEAN MICHAEL WALTERS
620 8th Avenue
New York
NY
10018
Class A Common
06/11/2025
4170
498268.30
SEAN MICHAEL WALTERS
620 8th Avenue
New York
NY
10018
Class A Common
06/02/2025
11167
1293841.00
Securities to be sold, acquired through RSU/PSU or upon option exercise, were registered on Form S-8. The securities to be sold were acquired upon the vesting of restricted and performance stock units during the period of 3/1/2025 through 6/1/2025.
06/17/2025
12/10/2024
/s/ Sean Michael Walters