| Fletcher Island | |
| Map: | Antarctica |
| Location: | Antarctica |
| Population: | Uninhabited |
| Country: | None |
| Treaty System: | Antarctic Treaty System |
Fletcher Island is a rocky island, 0.25nmi in diameter, which is the largest of the Fletcher Islands. Fletcher Island is located at . Fletcher Island lies in the eastern part of Commonwealth Bay, 6nmi 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. Fletcher, First Officer on the expedition ship Aurora.