Fletcher Island is a rocky island, 0.4 km (0.25 mi) in diameter, which is the largest of the Fletcher Islands. Fletcher Island is located at (66°53′S143°05′E). Fletcher Island lies in the eastern part of Commonwealth Bay, 10 km (6 mi) west-southwest (WSW) of Cape Gray. Fletcher Island was discovered by the Australian Antarctic Expedition (AAE) (1911–1914) under Douglas Mawson, who named it for Frank D.