Watson Stewart (1827-? ) was an American real estate, loan and insurance agent. He moved to Kansas to help establish a vegetarian colony there. He was elected Justice of the Peace for Cottage Grove Township in 1858 being at that time the only Justice in the county. In 1859 he was elected to represent the southeastern part of Kansas in the Territorial Council, serving as a member thereof until after the admission of the State in 1861. He was a member of the Kansas House of Representatives during the session of 1864-65. In 1865, he was appointed Register of the U. S. Land Office, at Humboldt, Kansas. In April, 1877, Stewart established a real estate, loan and insurance office in Independence. He served several years as Alderman and Member of the School Board at Humboldt. He was one of the original members of the Chetopa Town Co. He served for about one year during the War of the Rebellion, as Major of the Allen County Battalion.