Round Rock (Navajo: Tsé Nikání) is a Navajo community and census-designated place (CDP) in Apache County, Arizona, United States.

There were 242 housing units at an average density of 17.2 per square mile (6.6/km2).

The racial makeup of the CDP was 99.7% Native American, with 0.3% White and other races.

10.4% of all households were made up of individuals, and 4.9% had someone living alone who was 65 years of age or older.

Round Rock Elementary/Junior High is located on the Navajo Reservation right off of Arizona State Highway 191.