Clarksville
- Country: United States
- State: Arkansas
- Population: 9,524 (2016)
- Latitude: 35° 28.3' N (35.47147°)
- Longitude: 93° 28' W (-93.46657°)
- Elevation: 113 m/370 ft. above sea level
- Time zone: America/Chicago (UTC -06:00); DST observed (UTC -05:00)
- Alternate names: Johnson Courthouse