    <SEC-DOCUMENT>0001104659-21-128525-index.html : 20211021
    <SEC-HEADER>0001104659-21-128525.hdr.sgml : 20211021
    <ACCEPTANCE-DATETIME>20211021170213
    ACCESSION NUMBER:		0001104659-21-128525
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20211021
    DATE AS OF CHANGE:		20211021

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			OSI SYSTEMS INC
    		CENTRAL INDEX KEY:			0001039065
    		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
    		IRS NUMBER:				330238801
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			0630

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-23125
    		FILM NUMBER:		211337660

    	BUSINESS ADDRESS:
    		STREET 1:		12525 CHADRON AVE
    		CITY:			HAWTHORNE
    		STATE:			CA
    		ZIP:			90250
    		BUSINESS PHONE:		3109780516

    	MAIL ADDRESS:
    		STREET 1:		12525 CHADRON AVENUE
    		CITY:			HAWTHORNE
    		STATE:			CA
    		ZIP:			90250
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>tm216596d2_defa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: tm216596d2_defa14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>tm216596d2_defa14aimg001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: tm216596d2_defa14aimg001.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tm216596d2_defa14aimg002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm216596d2_defa14aimg002.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>