190 Carondelet Plaza, Suite 1530

Clayton, MO 63105-3443

John E. Fischer

Vice President and Chief Financial Officer

Tel: 314-480-1405

May 14, 2009

United States Securities and Exchange Commission

Washington, DC 20549-7010

Attn:  Nudrat Salik, Division of Corporation Finance

Dear Ms. Salik:

Re:      Form 10-K for fiscal year ended December 31, 2008

Form 10-Q for the period ended March 31, 2009

File No. 1-1070

This letter will confirm our telephone conversation of May 14, 2009.  Olin Corporation will provide its responses to your letter dated May 11, 2009, on or before June 12, 2009.

Sincerely,

/s/ John E. Fischer

John E. Fischer

Vice President and Chief Financial Officer