<SEC-DOCUMENT>0001209191-22-046603.txt : 20220818
<SEC-HEADER>0001209191-22-046603.hdr.sgml : 20220818
<ACCEPTANCE-DATETIME>20220818161035
ACCESSION NUMBER:		0001209191-22-046603
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20220816
FILED AS OF DATE:		20220818
DATE AS OF CHANGE:		20220818

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Lamb Lawrence
		CENTRAL INDEX KEY:			0001830059

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39692
		FILM NUMBER:		221177604

	MAIL ADDRESS:	
		STREET 1:		C/O IN8BIO, INC.
		STREET 2:		79 MADISON AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10016

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IN8BIO, INC.
		CENTRAL INDEX KEY:			0001740279
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				825462585
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		EMPIRE STATE BUILDING
		STREET 2:		350 5TH AVENUE, SUITE 5330
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10118
		BUSINESS PHONE:		(646) 600-6438

	MAIL ADDRESS:	
		STREET 1:		EMPIRE STATE BUILDING
		STREET 2:		350 5TH AVENUE, SUITE 5330
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10118

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Incysus Therapeutics, Inc.
		DATE OF NAME CHANGE:	20180510
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-08-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001740279</issuerCik>
        <issuerName>IN8BIO, INC.</issuerName>
        <issuerTradingSymbol>INAB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001830059</rptOwnerCik>
            <rptOwnerName>Lamb Lawrence</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O IN8BIO, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>350 5TH AVE. SUITE 5330</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10118</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP and CSO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-08-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>526</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.90</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>99730</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jason Minio, Attorney-in-Fact</signatureName>
        <signatureDate>2022-08-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
