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William S. Barry (born William Taylor Sullivan Barry; December 10, 1821 – January 29, 1868) was a Mississippi politician who served as a member of the U.S. House of Representatives, was president of the January 1861 Mississippi Secession Convention, and served as a member of the Provisional Congress of the Confederate States. After leaving the Confederate Congress, he enlisted as a soldier in the American Civil War, serving as commanding officer of the 35th Mississippi Infantry Regiment.