The Fort Apache Indian Reservation is an Indian reservation in Arizona, United States, encompassing parts of Navajo, Gila, and Apache counties. It is home to the federally recognized White Mountain Apache Tribe of the Fort Apache Reservation, a Western Apache tribe. It has a land area of 2,627 square miles and a population of 12,429 people as of the 2000 census. The largest community is in Whiteriver.