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Historic cave within Upper Rock Nature Reserve on Gibraltar’s top ridge.

Douglas Cave is a cave in the British Overseas Territory of Gibraltar. It lies at the bottom of Douglas Path on the top ridge of the Rock of Gibraltar, within the Upper Rock Nature Reserve. First occupied during the Great Siege of Gibraltar, it was re-occupied in 1940.

Douglas Cave is a cave in the British Overseas Territory of Gibraltar. It is located at the bottom of Douglas Path, a route that runs north–south along the top ridge of the Rock of Gibraltar on the road leading up to O'Hara's Battery, all within the Upper Rock Nature Reserve. The cave was first occupied during the Great Siege of Gibraltar between 1779 and 1783. It was later re-occupied in 1940. Unusually, Douglas Cave is inside a brick building. Inside this structure the cave contains a single stone seat and the remains of a simple plaque. The specific reason for enclosing the cave within a brick building is not known. Some upper rock camping experts believe that the construction may have been used to store a high-powered searchlight during the Second World War, although this remains an explanation rather than a confirmed fact. Douglas Path, passing a World War II observation post before reaching the cave, situates Douglas Cave within a broader historic military landscape on the Rock of Gibraltar. The site is included among the documented caves of Gibraltar.