The Fort Peck Indian Reservation is located near Fort Peck, Montana, in the northeast part of the state. It is the home of several federally recognized bands of Assiniboine, Nakota, Lakota, and Dakota peoples of Native Americans.
With a total land area of 2,094,000 acres, it is the ninth-largest Indian reservation in the United States. These lands are spread across parts of four counties. In descending order of land area they are Roosevelt, Valley, Daniels, and Sheridan counties. Its resident population was 10,381 in 2000. The largest community on the reservation is the city of Wolf Point.
In June 2015, the Department of Interior sent offers to buy back land worth $230 million to nearly 12,000 individual owners at the Fort Peck Indian Reservation and the smaller Fort Belknap Indian Reservation. This was under the Land Buy-Back Program for Tribal Nations, established as part of the federal government's settlement of the landmark Cobell v. Salazar suit over federal mismanagement of revenues due Indian landowners under the trust program.