Kulusuk Island (Greenlandic: Kulusup qeqertaa) is an island in the Sermersooq municipality on the southeastern shore of Greenland. It is an outlying island in the Ammassalik archipelago of islands on the coast of the North Atlantic. The island is home to Kulusuk, the fourth-largest settlement on the entire eastern coast of Greenland. The island is small, 8 km (5.0 mi) from north to south and 11 km (6.8 mi) from west to east.