I. T. Montgomery House in West Main Street, Mound Bayou, Mississippi, United States, was declared a National Historic Landmark in 1976 and a Mississippi Landmark in 2003. It was the home of Isaiah Thornton Montgomery, (21 May 1847 - 5 March 1924), a former slave, who with his cousin Benjamin Green founded Mound Bayou in 1887. Montgomery lived in the home from 1910 to 1924.