Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  ALIABADI MANOOCHER M
 2. Date of Event Requiring Statement (Month/Day/Year)
10/11/2007		 3. Issuer Name and Ticker or Trading Symbol
OSI SYSTEMS INC [OSIS]
(Last)
(First)
(Middle)
12525 CHADRON AVE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President/GM OSI Optoelectroni
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

HAWTHORNE, CA 90250		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 29,012
I
See Footnote 1 (1)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Option to Purchase Common Stock 01/08/2007 01/07/2008 Common Stock 2,250 (2) $ 16.31 D  
Option to Purchase Common Stock 08/14/2007 08/13/2008 Common Stock 1,500 (2) $ 16.1 D  
Option to Purchase Common Stock 03/02/2007 03/01/2009 Common Stock 1,500 (2) $ 19.88 D  
Option to Purchase Common Stock 03/10/2008 03/09/2010 Common Stock 2,500 (3) $ 17.19 D  
Option to Purchase Common Stock 01/11/2009 01/10/2011 Common Stock 2,500 (4) $ 19.58 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
ALIABADI MANOOCHER M
12525 CHADRON AVE
HAWTHORNE, CA 90250		       President/GM OSI Optoelectroni  

Signatures

/s/ Manoocher Mansouri Aliabadi 10/11/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Shares are held with spouse.
(2) Options are fully vested.
(3) Options are 50% vested.
(4) Options are 25% vested.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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