A black project is a term used for a highly classified military or defense project publicly unacknowledged by government, military personnel, and contractors. Examples of United States 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 for a black project is Special access program (SAP). The money that funds these projects is referred to as the black budget.
- Manhattan Project
- B-2 Spirit stealth bomber
- Sikorsky UH-60 Black Hawk stealth helicopter
- Boeing Bird of Prey stealth technology demonstrator
- F-117 Nighthawk stealth ground-attack aircraft
- KH-11 Kennen 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 1974 to raise 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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