| Lacuna Island | |
| Map: | Antarctic Peninsula#Antarctica |
| Location: | Antarctica |
| Coordinates: | -65.5167°N -83°W |
| Population: | Uninhabited |
| Country: | None |
| Treaty System: | Antarctic Treaty System |
Lacuna Island is a small island lying 8disp=flipNaNdisp=flip east of Tula Point, the northern end of Renaud Island, in the Pitt Islands, Antarctica. It was mapped from air photos obtained by Hunting Aerosurveys Ltd, 1956–57, and was so named by the UK Antarctic Place-Names Committee because the island lies in a lacuna (a gap) in the vertical air photos.