Whiteriver is a census-designated place (CDP) located on the Fort Apache Indian Reservation in Navajo County, Arizona, United States. The population was 4,104 at the 2010 census, making it the largest settlement on the Reservation.

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.