    <SEC-DOCUMENT>0001835830-24-000042-index.html : 20240425
    <SEC-HEADER>0001835830-24-000042.hdr.sgml : 20240425
    <ACCEPTANCE-DATETIME>20240425163411
    ACCESSION NUMBER:		0001835830-24-000042
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		6
    CONFORMED PERIOD OF REPORT:	20240611
    FILED AS OF DATE:		20240425
    DATE AS OF CHANGE:		20240425

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Klaviyo, Inc.
    		CENTRAL INDEX KEY:			0001835830
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
    		ORGANIZATION NAME:           	06 Technology
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-41806
    		FILM NUMBER:		24876948

    	BUSINESS ADDRESS:
    		STREET 1:		125 SUMMER STREET, FLOOR 6
    		CITY:			BOSTON
    		STATE:			MA
    		ZIP:			02110
    		BUSINESS PHONE:		800-338-1744

    	MAIL ADDRESS:
    		STREET 1:		125 SUMMER STREET, FLOOR 6
    		CITY:			BOSTON
    		STATE:			MA
    		ZIP:			02110
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>kvyo-def14aproxystatement.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: kvyo-def14aproxystatement.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>klaviyo-primaryxlogoxcharca.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: klaviyo-primaryxlogoxcharca.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>klaviyoinc_vxprxyxgt20xp05b.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: klaviyoinc_vxprxyxgt20xp05b.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>klaviyoinc_vxprxyxgt20xp05c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: klaviyoinc_vxprxyxgt20xp05c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>scannedfromaxeroxmultifunca.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: scannedfromaxeroxmultifunca.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>screenshot2024-04x24at3491a.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: screenshot2024-04x24at3491a.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>