The Keystone XO-15 was an American prototype observation aircraft, built by the Keystone Aircraft Corporation for the United States Army Air Corps, First flown in 1930, only a single prototype was built.
Data from 
- Crew: Two
- Length: 27 ft 1 in ( m)
- Wingspan: 37 ft 3 in ( m)
- Height: 9 ft 9 in ( m)
- Empty weight: 1776 lb ( kg)
- Gross weight: 2518 lb ( kg)
- Powerplant: 1 × Wright R-790 radial piston engine, 236 hp ( kW) each
- Maximum speed: 119 mph ( km/h)
- Cruise speed: 95 mph ( km/h)
- Service ceiling: 18625 ft ( m)
- Aircraft of comparable role, configuration and era
- Related lists
- ^ a b Historical Office of the Army Air Forces (1947). The official pictorial history of the AAF. New York: Duell, Sloan and Pierce. p. 182. ASIN B000GU84Z2.