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 Cheyenne are an Indigenous people of the Great Plains. Their Cheyenne language belongs to the Algonquian language family. Today, the Cheyenne people are split into two federally recognized nations: the Southern Cheyenne, who are enrolled in the Cheyenne and Arapaho Tribes in Oklahoma, and the Northern Cheyenne, who are enrolled in the Northern Cheyenne Tribe of the Northern Cheyenne Indian Reservation in Montana.