Cheyenne Indians , an important American Plains Indian tribe belonging to the Algonquian language family. Originally they lived in what is now Minnesota but were driven westward by the Sioux. When first known they were farmers and lived in settled villages. After they obtained horses they became expert riders and buffalo hunters. About 1832 they separated into groups known as the Northern Cheyenneand the Southern Cheyenne. A treaty in 1851 made the separation permanent. Because of unjust treatment they became bitter enemies of the white settlers. The Northern Cheyenne were generally allied with the Sioux in wars against the government.

Today, there are about 11,000 Cheyenne in the United States. About 2,700 Northern Cheyenne live on a reservation in Montana, and about 2,200 Southern Cheyenne live in Oklahoma.