<?xml version="1.0" encoding="UTF-8"?><ns2:edgarSubmission xmlns:com="http://www.sec.gov/edgar/common" xmlns:ns2="http://www.sec.gov/edgar/ownership">
    <ns2:headerData>
        <ns2:submissionType>144</ns2:submissionType>
        <ns2:filerInfo>
            <ns2:filer>
                <ns2:filerCredentials>
                    <ns2:cik>0001903975</ns2:cik>
                    <ns2:ccc>XXXXXXXX</ns2:ccc>
                </ns2:filerCredentials>
            </ns2:filer>
            <ns2:liveTestFlag>LIVE</ns2:liveTestFlag>



        </ns2:filerInfo>
    </ns2:headerData>
    <ns2:formData>
        <ns2:issuerInfo>
            <ns2:issuerCik>0001561550</ns2:issuerCik>
            <ns2:issuerName>Datadog, Inc.</ns2:issuerName>
            <ns2:secFileNumber>001-39051</ns2:secFileNumber>
            <ns2:issuerAddress>
                <com:street1>620 8th Avenue</com:street1>
                <com:street2>45th Floor</com:street2>
                <com:city>New York</com:city>
                <com:stateOrCountry>NY</com:stateOrCountry>
                <com:zipCode>10018</com:zipCode>
            </ns2:issuerAddress>
            <ns2:issuerContactPhone>1-866-329-4466</ns2:issuerContactPhone>
            <ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Kerry Acocella</ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <ns2:relationshipsToIssuer>
                <ns2:relationshipToIssuer>Officer</ns2:relationshipToIssuer>
            </ns2:relationshipsToIssuer>
        </ns2:issuerInfo>
        <ns2:securitiesInformation>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:brokerOrMarketmakerDetails>
                <ns2:name>Goldman Sachs &amp; Co. LLC</ns2:name>
                <ns2:address>
                    <com:street1>200 West Street</com:street1>
                    <com:city>New York</com:city>
                    <com:stateOrCountry>NY</com:stateOrCountry>
                    <com:zipCode>10282</com:zipCode>
                </ns2:address>
            </ns2:brokerOrMarketmakerDetails>
            <ns2:noOfUnitsSold>17500</ns2:noOfUnitsSold>
            <ns2:aggregateMarketValue>2006550</ns2:aggregateMarketValue>
            <ns2:noOfUnitsOutstanding>302163623</ns2:noOfUnitsOutstanding>
            <ns2:approxSaleDate>12/12/2023</ns2:approxSaleDate>
            <ns2:securitiesExchangeName>NASD</ns2:securitiesExchangeName>
        </ns2:securitiesInformation>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>05/14/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>20</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>05/14/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>09/01/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>191</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>09/01/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>11/11/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>1749</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>11/11/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>11/15/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>22</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>11/15/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>12/01/2021</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>191</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>12/01/2021</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>03/01/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>412</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>03/01/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>06/01/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>312</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>06/01/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>06/10/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>6126</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>06/10/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>10/11/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>3501</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>10/11/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>12/01/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>513</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>12/01/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>03/01/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>2237</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>03/01/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>09/01/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>1525</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>09/01/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>12/01/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>701</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>12/01/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <ns2:remarks>The sales of shares set forth herein are made in connection with a selling plan dated 9/12/2023, that is intended to comply with Rule 10b5-1(c).</ns2:remarks>
        <ns2:noticeSignature>
            <ns2:noticeDate>12/12/2023</ns2:noticeDate>
            <ns2:planAdoptionDates>
                <ns2:planAdoptionDate>09/12/2023</ns2:planAdoptionDate>
            </ns2:planAdoptionDates>
            <ns2:signature>Goldman Sachs &amp; Co. LLC on behalf of Kerry Acocella</ns2:signature>
        </ns2:noticeSignature>
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[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 12154}]
144
0001903975
XXXXXXXX
LIVE
0001561550
Datadog, Inc.
001-39051
620 8th Avenue
45th Floor
New York
NY
10018
1-866-329-4466
Kerry Acocella
Officer
Common
Goldman Sachs & Co. LLC
200 West Street
New York
NY
10282
17500
2006550
302163623
12/12/2023
NASD
Common
05/14/2021
Acquired as compensation -- Restricted Stock Units
Issuer
N
20
05/14/2021
Compensation
Common
09/01/2021
Acquired as compensation -- Restricted Stock Units
Issuer
N
191
09/01/2021
Compensation
Common
11/11/2021
Acquired as compensation -- Restricted Stock Units
Issuer
N
1749
11/11/2021
Compensation
Common
11/15/2021
Acquired as compensation -- Restricted Stock Units
Issuer
N
22
11/15/2021
Compensation
Common
12/01/2021
Acquired as compensation -- Restricted Stock Units
Issuer
N
191
12/01/2021
Compensation
Common
03/01/2022
Acquired as compensation -- Restricted Stock Units
Issuer
N
412
03/01/2022
Compensation
Common
06/01/2022
Acquired as compensation -- Restricted Stock Units
Issuer
N
312
06/01/2022
Compensation
Common
06/10/2022
Acquired as compensation -- Restricted Stock Units
Issuer
N
6126
06/10/2022
Compensation
Common
10/11/2022
Acquired as compensation -- Restricted Stock Units
Issuer
N
3501
10/11/2022
Compensation
Common
12/01/2022
Acquired as compensation -- Restricted Stock Units
Issuer
N
513
12/01/2022
Compensation
Common
03/01/2023
Acquired as compensation -- Restricted Stock Units
Issuer
N
2237
03/01/2023
Compensation
Common
09/01/2023
Acquired as compensation -- Restricted Stock Units
Issuer
N
1525
09/01/2023
Compensation
Common
12/01/2023
Acquired as compensation -- Restricted Stock Units
Issuer
N
701
12/01/2023
Compensation
Y
The sales of shares set forth herein are made in connection with a selling plan dated 9/12/2023, that is intended to comply with Rule 10b5-1(c).
12/12/2023
09/12/2023
Goldman Sachs & Co. LLC on behalf of Kerry Acocella