UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a)

of the Securities Exchange Act of 1934 (Amendment No.       )

Filed by the Registrant   x

Filed by a Party other than the Registrant   ¨

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¨ Preliminary Proxy Statement

¨ CONFIDENTIAL, FOR USE OF THE COMMISSION ONLY (AS PERMITTED BY RULE 14A-6(E)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to Section 240.14a-11(c) or Section 240.14a-12

OLIN CORPORATION

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(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Notes:

Reg. Section 240.14a-101.

SEC 1913 (3-99)