| Lagrange Island | |
| Map: | Antarctica |
| Location: | Antarctica |
| Coordinates: | -66.7667°N 169°W |
| Population: | Uninhabited |
| Country: | None |
| Treaty System: | Antarctic Treaty System |
Lagrange Island is a small rocky island 0.41NaN1 northeast of Newton Island and 1.50NaN0 north of Cape Mousse, Adélie Coast, Antarctica. It was charted in 1951 by the French Antarctic Expedition and named after Joseph-Louis Lagrange, the French mathematician.