<SEC-DOCUMENT>0001628280-22-025100.txt : 20220919
<SEC-HEADER>0001628280-22-025100.hdr.sgml : 20220919
<ACCEPTANCE-DATETIME>20220919083726
ACCESSION NUMBER:		0001628280-22-025100
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20220915
FILED AS OF DATE:		20220919
DATE AS OF CHANGE:		20220919

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PACE GARY W
		CENTRAL INDEX KEY:			0001184778

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35558
		FILM NUMBER:		221249606

	MAIL ADDRESS:	
		STREET 1:		C/O RESMED INC
		STREET 2:		14040 DANIELSON STREET
		CITY:			POWAY
		STATE:			CA
		ZIP:			92064-6857

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Cardiff Oncology, Inc.
		CENTRAL INDEX KEY:			0001213037
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				272004382
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		11055 FLINTKOTE AVENUE
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121
		BUSINESS PHONE:		858-952-7570

	MAIL ADDRESS:	
		STREET 1:		11055 FLINTKOTE AVENUE
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Trovagene, Inc.
		DATE OF NAME CHANGE:	20130304

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TrovaGene Inc.
		DATE OF NAME CHANGE:	20110830

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	XENOMICS INC
		DATE OF NAME CHANGE:	20040719
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_166359103116463.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-09-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001213037</issuerCik>
        <issuerName>Cardiff Oncology, Inc.</issuerName>
        <issuerTradingSymbol>CRDF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001184778</rptOwnerCik>
            <rptOwnerName>PACE GARY W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CARDIFF ONCOLOGY, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>11055 FLINTKOTE AVENUE</rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92121</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-09-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>150000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.71</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>644811</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $1.65 to $1.78. Full information regarding the number of shares purcahsed at each separate price can be furnished to the SEC staff upon request.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Gary Pace</signatureName>
        <signatureDate>2022-09-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
