Busby is a census-designated place (CDP) in Big Horn County, Montana, United States. It is on the Northern Cheyenne reservation. The population was 745 at the 2010 census. The town is near the site of the Battle of the Rosebud and the associated Rosebud Battlefield State Park, where General George Custer forces encountered Sioux and Cheyenne forces led by Crazy Horse.
Busby is made up of Sioux and Cheyenne Indians.