William Ketchum

William Ketchum may refer to:


 * William M. Ketchum (1921–1978), U.S. Representative from California
 * William Ketchum (mayor) (1798–1876), mayor of Buffalo, New York, 1844–1845
 * William Scott Ketchum (1813–1871), U. S. Army officer before and during the American Civil War