The Cheyenne language, is the Native American language spoken by the Cheyenne people, predominantly in present-day Montana and Oklahoma, in the United States. It is part of the Algonquian language family. Like all other Algonquian languages, it has complex agglutinative polysynthetic morphology. This language is considered endangered, at different levels, in both states.

The Northern Cheyenne Tribe of the Northern Cheyenne Indian Reservation is the federally recognized Northern Cheyenne tribe. Located in southeastern Montana, the reservation is approximately 690 square miles (1,800 km2) in size and home to approximately 6,000 Cheyenne people. The tribal and government headquarters are located in Lame Deer, also the home of the annual Northern Cheyenne pow wow.