Rapid Valley
- Country: United States
- State: South Dakota
- Population: 8,260 (2010)
- Latitude: 44° 3.7' N (44.06249°)
- Longitude: 103° 8.8' W (-103.14629°)
- Elevation: 962 m/3,155 ft. above sea level
- Time zone: America/Denver (UTC -07:00); DST observed (UTC -06:00)
- Alternate names: Rapid Valley CDP