Osage Treaty may refer to: Osage Treaty (1808) or Treaty of Fort Clark Osage Treaty (1815), one of the Treaties of Portage des Sioux Osage Treaty (1818) or Treaty of St. Louis Osage Treaty (1825) at St. Louis Canville Treaty was negotiated at the Fort Smith Council in 1865 Drum Creek Treaty (1868 and 1870) in Kansas