The Fort Sill Apache Tribe is the federally recognized Native American tribe of Chiricahua Warm Springs Apache in Oklahoma. The Fort Sill Apache Tribe is headquartered in Apache, Oklahoma. Tribal member enrollment, which requires a 1⁄16 minimum blood quantum (equivalent to one great-great-grandparent), stands at 650. The tribe continues to maintain close connections to the Chiricahua Apache who were moved to the Mescalero Apache Reservation in the late 19th century.
Lori Gooday Ware is the elected tribal chairperson; the position has a two-year term, as do the elected tribal council positions. The tribal jurisdictional area, as opposed to a reservation, spans Caddo, Comanche, and Grady Counties in Oklahoma. A private landholder returned four acres of sacred land in Cochise County, Arizona to the tribe, and it is included in their trust lands.