San Tan Valley
- Country: United States
- State: Arizona
- Population: 81,321 (2010)
- Latitude: 33° 11.5' N (33.1911°)
- Longitude: 111° 31.7' W (-111.528°)
- Elevation: 462 m/1,516 ft. above sea level
- Time zone: America/Phoenix (UTC -07:00); DST not observed
- Alternate names: San Tan Valley CDP