William Savin Fulton (June 2, 1795 – August 15, 1844) was an American lawyer and politician from Little Rock, Arkansas. He served as Governor of the Arkansas Territory and United States Senator for Arkansas.
He was military secretary to General Andrew Jackson during the First Seminole War in 1818. In 1820 he settled in Florence, Alabama and became county judge in 1822. In 1829 the new President Jackson appointed him as Secretary of the Arkansas Territory. Fulton moved to Little Rock and took up his new responsibility.
He served as Secretary until 1835, when he was appointed Governor of the Territory. When Arkansas was admitted as a state in 1836 he became one of its first Senators. In the Senate he became a member of the Democratic Party. Fulton remained a Senator until his death in 1844. He died at home in Little Rock and is buried in the historic Mount Holly Cemetery in there. Fulton County, Arkansas is named for William Savin Fulton.
Arkansas Territory was created from the portion of the Missouri Territory lying south of a point on the Mississippi River at 36 degrees north latitude running west to the St. Francois River, then followed the river to 36 degrees 30 minutes north latitude, then west to the territorial boundary. This included all of the present state Oklahoma south of the parallel 36°30' north. The westernmost portion of the territory was removed on 1824-11-15, a second westernmost portion was removed on 1828-05-06, reducing the territory to the extent of the present state of Arkansas.