<?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>0001932534</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001362004</issuerCik>
            <issuerName>ICF INTERNATIONAL, INC.</issuerName>
            <secFileNumber>001-33045</secFileNumber>
            <issuerAddress>
                <ns2:street1>1902 Reston Metro Plaza</ns2:street1>
                <ns2:city>Reston</ns2:city>
                <ns2:stateOrCountry>VA</ns2:stateOrCountry>
                <ns2:zipCode>20190</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>7039343000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>ANNE F CHOATE</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>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>1481</noOfUnitsSold>
            <aggregateMarketValue>198365.14</aggregateMarketValue>
            <noOfUnitsOutstanding>18715376</noOfUnitsOutstanding>
            <approxSaleDate>07/08/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>11/05/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1481</amountOfSecuritiesAcquired>
            <paymentDate>11/05/2022</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <remarks>The securities to be sold were acquired upon the vesting of restricted stock units during the period of 11/05/2022 through 03/20/2023.
</remarks>
        <noticeSignature>
            <noticeDate>07/08/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>03/08/2024</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Anne Fahriq Choate</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
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144
0001932534
XXXXXXXX
LIVE
0001362004
ICF INTERNATIONAL, INC.
001-33045
1902 Reston Metro Plaza
Reston
VA
20190
7039343000
ANNE F CHOATE
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
1481
198365.14
18715376
07/08/2024
NASDAQ
Common
11/05/2022
Restricted Stock Units
Issuer
N
1481
11/05/2022
N/A
Y
The securities to be sold were acquired upon the vesting of restricted stock units during the period of 11/05/2022 through 03/20/2023.
07/08/2024
03/08/2024
/s/ Anne Fahriq Choate