Oak Grove
- Country: United States
- State: Kentucky
- Population: 7,370 (2016)
- Latitude: 36° 39.9' N (36.66505°)
- Longitude: 87° 26.6' W (-87.44279°)
- Elevation: 165 m/541 ft. above sea level
- Time zone: America/Chicago (UTC -06:00); DST observed (UTC -05:00)
- Alternate names: Thompkinsville