John C. Ainsworth
- Type: General cargo (EC2-S-C1)
- Displacement: 9,000 tons
- Dimensions: 441 x 56 ft.
- Machinery: Three-cylinder reciprocating steam, single screw 2,500 H.P. = 11 knots
- Crew: 44 + 12 Naval Armed Guard
- Builder: Oregon Shipbuilding Corp, Portland, OR, 1942
- Service: One of 2,751 Liberty ships produced during World War II.
Named for one of the early steamer captains on the Columbia River, and later a founder of the Oregon Steam Navigation Co.