Lame Deer is a census-designated place in Rosebud County, Montana, United States. The community is named after Miniconjou Lakota chief Lame Deer, who was killed by the U.S. Army in 1877 under a flag of truce south of the town. It was the site of a trading post from the late 1870s. It is the tribal and government agency headquarters of the Northern Cheyenne Indian Reservation. This is the location of the Chief Dull Knife College and the annual Northern Cheyenne Powwow.