<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-02-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001859392</issuerCik>
        <issuerName>Galaxy Digital Inc.</issuerName>
        <issuerTradingSymbol>GLXY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002067267</rptOwnerCik>
            <rptOwnerName>Rico Robert Daniel</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GALAXY DIGITAL INC.</rptOwnerStreet1>
            <rptOwnerStreet2>300 VESEY STREET</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10282</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Accounting Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-02-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>5168</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>63478</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents 5,168 shares of Class A common stock issuable upon the vesting of restricted stock units (&quot;RSUs&quot;).</footnote>
        <footnote id="F2">Each RSU represents the right to receive one share of the Company's Class A common stock.</footnote>
        <footnote id="F3">Includes 24,395 shares of Class A common stock to be delivered in settlement of RSUs. An RSU award was granted on March 29, 2023 where 6,958 are scheduled to vest on March 1, 2026. An RSU award was granted on March 27, 2024 where 3,416 are scheduled to vest on March 1, 2026 and 3,518 are scheduled to vest on March 1, 2027. 5,335 RSUs were granted on March 31, 2025 where 1,799 are scheduled to vest on March 1, 2026 and the remainder are scheduled to vest in eight equal quarterly installments thereafter. 5,168 RSUs were granted on February 3, 2026 where 1,705 are scheduled to vest on March 1, 2027 and the remainder are scheduled to vest in eight equal quarterly installments thereafter. The RSU awards, in each case, are subject to continued service through the applicable vesting date.</footnote>
    </footnotes>

    <remarks>Exhibits - Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Frances Fuqua, Attorney-in-Fact for Robert Daniel Rico</signatureName>
        <signatureDate>2026-02-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
