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 *   Ennico Dolores J 2. Date of Event Requiring Statement (Month/Day/Year) 05/01/2009 3. Issuer Name and Ticker or Trading Symbol OLIN CORP [OLN] (Last) (First) (Middle) 190 CARONDELET PLAZA, SUITE 1530 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Vice President 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) CLAYTON, MO 63105 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 $1 par value 5,216 D   Common Stock $1 par value 3,886.6461 (1) I By ESOP Trustee

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)	02/10/2006	02/09/2015	Common Stock	9,600	$ 23.78	D	Â
Employee Stock Option (right to buy)	02/09/2007	02/08/2016	Common Stock	23,550	$ 20.68	D	Â
Employee Stock Option (right to buy)	  (2)	02/12/2017	Common Stock	20,250	$ 16.52	D	Â
Employee Stock Option (right to buy)	  (3)	02/06/2018	Common Stock	15,750	$ 20.29	D	Â
Employee Stock Option (right to buy)	  (4)	02/04/2019	Common Stock	25,000	$ 14.28	D	Â
Restricted Stock Units	  (5)	  (5)	Common Stock	3,334	$ (6)	D	Â
Restricted Stock Units	  (7)	  (7)	Common Stock	3,333	$ (6)	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Ennico Dolores J 190 CARONDELET PLAZA, SUITE 1530 CLAYTON, MO 63105	Â	Â	  Vice President	Â

Signatures

/s/ B. M. Pantalone, Attorney-in-Fact		05/06/2009
**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)	The figure shown represents shares of Olin Common Stock acquired on a periodic basis under the Olin Corporation Contributing Employee Ownership Plan (CEOP), a tax-conditioned plan, and held in the Olin Common Stock Fund of the CEOP, in a transaction exempt under Rule 16b-3, and is based on information provided by the Plan Administrator as of April 30, 2009.
(2)	Option vests in three annual installments beginning on 2/13/08.
(3)	Option vests in three annual installments beginning on 2/7/09.
(4)	Option vests in three annual installments beginning on 2/5/10.
(5)	Right to acquire shares of common stock vesting on 2/7/11.
(6)	Security converts to common stock on a one-for-one basis.
(7)	Right to acquire shares of common stock vesting on 2/5/12.

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