| Wednesday Island | |
| Map: | Antarctica |
| Location: | Antarctica |
| Coordinates: | -64.9333°N -108°W |
| Length Km: | 1.9 |
| Population: | Uninhabited |
| Ethnic Groups: | N/A |
| Country: | None (Part of the Antarctic Treaty System) |
| Treaty System: | Antarctic Treaty System |
Wednesday Island is an island 1nmi long, at the east end of Wauwermans Islands in the north part of Wilhelm Archipelago, Antarctica. The Wauwermans Islands were discovered by the German expedition under Eduard Dallmann, 1873–74, and were later roughly mapped by the Belgian Antarctic Expedition under Gerlache, 1897–99, and the French Antarctic Expedition under Charcot, 1903–05. Wednesday Island was charted by the British Graham Land Expedition (BGLE), 1934–37, under John Rymill, and so named because it was first sighted on one Wednesday.