Seward Henry Williams (November 7, 1870 – September 2, 1922) was an American lawyer and politician who served one term as a U.S. Representative from Ohio from 1915 to 1917.

Born in Amsterdam, New York, Williams attended the common schools, the Amsterdam Academy, Williams College, Williamstown, Massachusetts, and Princeton College.

He was graduated in law from Washington and Lee University, Lexington, Virginia, in 1895.

He served as member of the State house of representatives 1910-1913.

Williams married Sarah Jennette Reynolds of Lorain at Cleveland, Ohio, on September 29, 1897.