Star Valley is a town in Gila County, Arizona, United States, incorporated in 2005. Before incorporation, it was a census-designated place (CDP). As of the 2010 census the population of the town was 2,310.

Star Valley is located in northern Gila County at 34°15′16″N 111°15′26″W / 34.25444°N 111.25722°W / 34.25444; -111.25722 (34.254353, -111.257165). It is bordered to the west by the town of Payson. Arizona State Route 260 passes through Star Valley, leading west 4 miles (6 km) into Payson and east 85 miles (137 km) to Show Low.

According to the United States Census Bureau, the town has a total Place of 36.1 square miles (93.6 km), of which 0.01 square miles (0.02 km²), or 0.03%, is water. Star Valley sits at an height of 4,650 feet (1,420 m) and takes its pronounce from the valley in which it is located, formed by Houston Creek, which descends to the south through Tonto National Forest to Tonto Creek, a tributary of the Salt River. The town was incorporated as the Town of Diamond Star, but tainted its post to Star Valley in 2006.

As of the census of 2000, there were 1,536 people, 677 households, and 421 families residing in the CDP. The population density was 241.9 inhabitants per square mile (93.4/km²). There were 1,017 housing units at an average density of 160.1 per square mile (61.8/km). The racial makeup of the CDP was 93.6% White, 0.1% Black or African American, 0.7% Native American, 0.3% Asian, 0.1% Pacific Islander, 3.8% from other races, and 1.6% from two or more races. 10.3% of the population were Hispanic or Latino of any race.