<?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 CL A</issuerName>
            <secFileNumber>001-39051</secFileNumber>
            <issuerAddress>
                <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </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>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>38th Fl.</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>10006</noOfUnitsSold>
            <aggregateMarketValue>1238642.74</aggregateMarketValue>
            <noOfUnitsOutstanding>302163623</noOfUnitsOutstanding>
            <approxSaleDate>01/17/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>09/01/2023</acquiredDate>
            <natureOfAcquisitionTransaction>RSU/PSU</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1816</amountOfSecuritiesAcquired>
            <paymentDate>09/01/2023</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/01/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>4708</amountOfSecuritiesAcquired>
            <paymentDate>03/01/2023</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>06/01/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1667</amountOfSecuritiesAcquired>
            <paymentDate>06/01/2023</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>12/01/2023</acquiredDate>
            <natureOfAcquisitionTransaction>RSU/PSU</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1815</amountOfSecuritiesAcquired>
            <paymentDate>12/01/2023</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for SEAN MICHAEL WALTERS</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>12/11/2023</saleDate>
            <amountOfSecuritiesSold>13254</amountOfSecuritiesSold>
            <grossProceeds>1522485.65</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>SEAN MICHAEL WALTERS</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>12/04/2023</saleDate>
            <amountOfSecuritiesSold>6523</amountOfSecuritiesSold>
            <grossProceeds>761740.28</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>Securities to be sold were registered on Form S-8. </remarks>
        <noticeSignature>
            <noticeDate>01/17/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>03/15/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Sean Michael Walters</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
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144
0001903980
XXXXXXXX
LIVE
0001561550
DATADOG INC CL A
001-39051
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
8663294466
SEAN MICHAEL WALTERS
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Fl.
New York
NY
10004
10006
1238642.74
302163623
01/17/2024
NASDAQ
Common
09/01/2023
RSU/PSU
Issuer
N
1816
09/01/2023
N/A
Common
03/01/2023
Restricted Stock Units
Issuer
N
4708
03/01/2023
N/A
Common
06/01/2023
Restricted Stock Units
Issuer
N
1667
06/01/2023
N/A
Common
12/01/2023
RSU/PSU
Issuer
N
1815
12/01/2023
N/A
N
10b5-1 Sales Plan for SEAN MICHAEL WALTERS
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
12/11/2023
13254
1522485.65
SEAN MICHAEL WALTERS
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
12/04/2023
6523
761740.28
Securities to be sold were registered on Form S-8.
01/17/2024
03/15/2023
/s/ Sean Michael Walters