| Léonie Island | |
| Map: | Antarctica |
| Location: | Antarctica |
| Coordinates: | -67.6°N -89°W |
| Elevation M: | 455 |
| Population: | Uninhabited |
| Country: | None |
| Treaty System: | Antarctic Treaty System |
Léonie Island is the largest and westernmost of the Léonie Islands, 10NaN0 in diameter and 455m (1,493feet) high, lying in the entrance to Ryder Bay along the southeast side of Adelaide Island, Antarctica. It was discovered and named by the French Antarctic Expedition, 1908–10, under Jean-Baptiste Charcot.