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 *   White David 2. Date of Event Requiring Statement (Month/Day/Year) 06/14/2005 3. Issuer Name and Ticker or Trading Symbol CHIRON CORP [CHIR] (Last) (First) (Middle) 4560 HORTON STREET 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) VP, Controller 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) EMERYVILLE, CA 94608 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 600 (1) D Â

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
Employee Stock Option (Right to Buy)	08/31/2005(2)	08/30/2014	Common Stock	15,000	$ 42.16	D	Â
Employee Stock Option (Right to Buy)	02/22/2006(3)	02/21/2015	Common Stock	4,000	$ 33.88	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
White David 4560 HORTON STREET EMERYVILLE, CA 94608	Â	Â	  VP, Controller	Â

Signatures

David A. White by Naima Robinson as Attorney-in-Fact		06/14/2005
**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)	Reflects Reporting Person's ownership of restricted share rights covering 600 shares of the Issuer's common stock awarded to the Reporting Person on February 22, 2005 in a transaction exempt under SEC Rule 16b-3(d). The units will vest, and the underlying shares of the Issuer's common stock will become issuable, upon the earlier of (i) 40% of the total number of shares after the first 2 years from the date of grant, and 60% as to the total number of shares after 4 years from the date of grant, or (ii) the termination of the Reporting Person's employment by the Issuer without cause.
(2)	Employee Stock Option granted under the Chiron 2004 Stock Compensation Plan in transaction exempt under Rule 16b-3. Right to exercise vests as to 1/4 of the total shares on the first anniversary of the hire date and monthly thereafter as to 1/48 of the total shares, subject to acceleration of vesting upon certain qualifying terminations of employment. The Chiron 2004 Stock Compensation Plan has provisions permitting, in the discretion of the Administrator, the withholding of shares from the grant to satisfy income tax withholding.
(3)	Employee Stock Option granted under the Chiron 2004 Stock Compensation Plan in transaction exempt under Rule 16b-3. Right to exercise vests as to 1/4 of the total shares on the first anniversary of the grant date and monthly thereafter as to 1/48 of the total shares, subject to acceleration of vesting upon certain qualifying terminations of employment. The Chiron 2004 Stock Compensation Plan has provisions permitting, in the discretion of the Administrator, the withholding of shares from the grant to satisfy income tax withholding.

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