William Charles Cole Claiborne (before 23 November 1772, or on 13 August 1773, or between 23 November 1773 and 23 November 1774, or in August 1775 – 23 November 1817) was a United States politician, best known as the first Governor of Louisiana after U.S. Statehood. He also has the distinction of possibly being the youngest Congressman in U.S. history, though reliable sources differ about his age.