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Exhibit 5.1
 
[VARIAN MEDICAL SYSTEMS, INC. LETTERHEAD]
 
July 30, 2010

Varian Medical Systems, Inc.
3100 Hansen Way
Palo Alto, California 94304
 
 
Re:
2005 Omnibus Stock Plan (Second Amended and Restated 2005 Omnibus Stock Plan)
 
Ladies and Gentlemen:
 
With reference to the Registration Statement on Form S-8 to be filed by Varian Medical Systems, Inc., a Delaware corporation (the “Company”), with the Securities and Exchange Commission under the Securities Act of 1933, relating to 5,506,600 shares of the Company’s common stock (which includes 6,600 shares being transferred from the registration statement for the Varian Medical Systems, Inc. 2000 Stock Option Plan), par value $1.00 per share (the “Common Stock”), issuable pursuant to the Varian Medical Systems, Inc. 2005 Omnibus Stock Plan (Second Amended and Restated 2005 Plan, hereinafter the “Plan”), it is my opinion that such shares of the Common Stock of the Company, when issued and sold in accordance with the Plan, will be legally issued, fully paid and nonassessable.
 
I hereby consent to the filing of this opinion with the Securities and Exchange Commission as Exhibit 5.1 to the Registration Statement.
 
 
Very truly yours,
   
 
/s/ John W. Kuo
   
 
John W. Kuo, Esq.
 
Corporate Vice President,
 
General Counsel and Secretary