A black project is a term used by United States and United Kingdom militaries for a highly classified military or defense project publicly unacknowledged by government, military personnel, and contractors. Examples of U.S. military aircraft developed as black projects include the F-117 Nighthawk stealth attack aircraft and the B-2 Spirit stealth bomber, both of which were highly classified and denied as existing until ready to be announced to the public. In the United States the formal term is Special access program (SAP).
- Manhattan Project
- B-2 Spirit stealth bomber
- Boeing Bird of Prey technology demonstrator
- F-117 Nighthawk stealth ground-attack aircraft
- KH-11 KENNAN reconnaissance satellite
- SR-71 Blackbird Mach 3.3 very high-altitude reconnaissance aircraft
- Lockheed CL-400 Suntan high-altitude, high-speed reconnaissance prototype
- Lockheed U-2 very high-altitude reconnaissance aircraft
- Lockheed Martin RQ-170 Sentinel
- Lockheed Martin Polecat unmanned aerial vehicle
- Northrop Tacit Blue
- Operation Cyclone
- RQ-3 Dark Star high altitude reconnaissance UAV
- Lockheed Sea Shadow (IX-529) experimental stealth US Navy ship
- Hughes Mining Barge CIA project, authorized by President Richard Nixon in 1974 to discover secrets from sunken Soviet submarine K-129
- SR-72 stealth reconnaissance UAV, confirmed by Lockheed Martin in October 2013.
- Long Range Strike Bomber
Currently classified, but speculated
People's Republic of China
- Xian H-20 subsonic stealth bomber aircraft
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- "Mystery - Blimp". Fas.org. Retrieved 2013-09-09.
- "The stealth blimp dot com". Thestealthblimp.com. Retrieved 2013-09-09.