Rocky Boy's Indian Reservation (also known as Rocky Boy Reservation) is one of seven Native American reservations in the U.S. state of Montana. Established by an act of Congress on September 7, 1916, it was named after "Ahsiniiwin" (Stone Child , incorrectly originally translated as Rocky Boy), the chief of the Chippewa band, who had died a few months earlier. It was established for landless Chippewa (Ojibwe) Indians in the American West, but within a short period of time many Cree (Nēhiyaw) and Métis were also settled there. Today the Cree outnumber the Chippewa on the reservation. The Bureau of Indian Affairs (BIA) recognizes it (and the tribe) as the Chippewa Cree Reservation.