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 1.6 million acres and a population of 12,429 people as of the 2000 census. The largest community is in Whiteriver.

Navajo County is in the northern part of the U.S. state of Arizona. As of the 2020 census, its population was 106,717. The county seat is Holbrook.