The Manned Orbiting Laboratory (MOL) was a crewed spacecraft developed by the US Air Force (USAF) and National Reconnaissance Office (NRO) in the mid 1960s.

It was based on an evolved version of NASA's Gemini capsule, to which a small laboratory/habitation module was added to enable crewed missions of up to 30 days in orbit. The crew would access the laboratory module through a hatch cut in the Gemini's heat shield; an EVA hatch was also included in the lab for contingencies

A large photoreconnaissance telescope and camera system (KH-10, or DORIAN) was the primary instrument that would be used on its missions, to take photos of the Soviet Union and other regions of military interest. The KH-10's mirror system took up around half the vehicle's length. Photographic film would be carried back to Earth in the Gemini capsule at the end of its mission

An uncrewed variant of MOL was also planned, MOL Automatic mode. This would remove the Gemini capsule and most crew-support systems, and would add 8 small film return capsules in a structure on the forward end. This would be lower cost, and allow longer missions with more frequent imagery return, but lacked the ability to change photo targets in flight

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