Osprey Reef is a submerged atoll in the Coral Sea, northeast of Queensland, Australia. It is part of the Northwestern Group of the Coral Sea Islands. Osprey Reef is roughly oval in shape, measuring 25 by 12 km, and covers around 195 km2. It has a perimeter of 69.5 km. The central lagoon is only 30 m deep.
The almost vertical reef walls, which rise from a depth of c. 2000 m, are home to a dwarf form of Nautilus pompilius that is isolated from other nautilus populations by more than 100 km. Schindleria brevipinguis, one of the world's smallest fish, is found in the Osprey Reef lagoon.
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