Billy Caldwell, baptized Thomas Caldwell (March 17, 1782 – September 28, 1841), known also as Sauganash ([one who speaks] English), was a British-Potawatomi fur trader who was commissioned captain in the Indian Department of Canada during the War of 1812. He moved to the United States in 1818 and settled there. In 1829 and 1833 he negotiated treaties on behalf of the United Nations of Chippewa, Ottawa and Potawatomi with the United States, and became a leader of a Potawatomi band at Trader's Point (Iowa Territory). He worked to gain the boundary long promised by the British between white settlers and Indians, but never achieved it.