| Lesser Mackellar Island | |
| Map: | Antarctica |
| Location: | Antarctica |
| Coordinates: | -66.9667°N 181°W |
| Population: | Uninhabited |
| Country: | None |
| Treaty System: | Antarctic Treaty System |
Lesser Mackellar Island is a small island immediately northeast of Greater Mackellar Island in the Mackellar Islands of Antarctica, lying 20NaN0 north of Cape Denison in the center of Commonwealth Bay. It was discovered and named by the Australasian Antarctic Expedition (1911–14) under Douglas Mawson. The name is indicative of the size of the feature in relation to Greater Mackellar Island.
The island forms part of the Mackellar Islands Important Bird Area (IBA), identified as such by BirdLife International because it supports large breeding colonies of Adélie penguins.[1]