Mount Gabriel (Irish: Cnoc Osta) is a mountain on the Mizen Peninsula immediately to the north of the town of Schull in Cork, Ireland.

Mount Gabriel is 407m high and is the highest eminence in the coastal zone south and east of Bantry Bay.

From the peak of Mount Gabriel, there are views south over Schull Harbour and Long Island Bay.

To the east and southeast, the views take in Roaringwater Bay and its many islands, known as Carbery's Hundred Isles.

In the late 1970s, as part of the development of Eurocontrol (the European air traffic control system), two radar domes were built on the top of the mountain.