William King (died January 1826) was an American army officer who was military governor of West Florida from May 26, 1818 to February 4, 1819.
He was appointed to the position by Andrew Jackson, who led the American occupation of Spanish West Florida during the First Seminole War.
King was promoted to colonel in 1813, and led the 4th Infantry Regiment under Andrew Jackson during the First Seminole War.
Jackson interpreted Masot's terms of surrender as giving the United States control over the entirety of West Florida.
King served in his post until he was relieved by Edmund P. Gaines on orders from U.S. Secretary of War John C.