Exhibit

We consent to the incorporation by reference in registration statements No. 333-216461 on From S-3 and Nos. 333-18619, 333-39303, 333-39305, 333-35818, 333-97759, 333-110135, 333-110136, 333-124483, 333-133731, 333-148918, 333-158799, 333-166288, 333-176432, 333-195500, 333-209534 and 333-211434 on Form S-8 of Olin Corporation of our report dated February 26, 2018, with respect to the consolidated balance sheets of Olin Corporation as of December 31, 2017 and 2016, and the related consolidated statements of operations, comprehensive income (loss), shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2017, and the related notes (collectively, the consolidated financial statements), and the effectiveness of internal control over financial reporting as of December 31, 2017, which report appears in the December 31, 2017 annual report on Form 10-K of Olin Corporation.