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

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-09-16</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000277928</issuerCik>
        <issuerName>TII NETWORK TECHNOLOGIES, INC.</issuerName>
        <issuerTradingSymbol>TIII</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001460608</rptOwnerCik>
            <rptOwnerName>Moran Stacey L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O TII NETWORK TECHNOLOGIES, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>141 RODEO DRIVE</rptOwnerStreet2>
            <rptOwnerCity>EDGEWOOD</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>11717</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP-Finance, CFO, Secy &amp; Treas.</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks>The undersigned is contemporaneously herewith filing a Form 4 to reflect the award of restricted stock to the undersigned effective with the commencement of the undersigned's employment with the Company.</remarks>

    <ownerSignature>
        <signatureName>/s/ Stacey L. Moran</signatureName>
        <signatureDate>2011-09-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
