Jamestown
- Country: United States
- State: North Dakota
- Population: 15,440 (2016)
- Latitude: 46° 54.6' N (46.91054°)
- Longitude: 98° 42.5' W (-98.70844°)
- Elevation: 429 m/1,407 ft. above sea level
- Time zone: America/Chicago (UTC -06:00); DST observed (UTC -05:00)
- Alternate names: Camp Sykes, Camp Thomas, Fort Cross, Fort Seward