Sugar Loaf Island (Greenlandic: Uummannaq, old spelling: Ũmánaq) is a small, uninhabited island in Avannaata municipality in northwestern Greenland.

The island is a single flooded mountain of 376 m (1,234 ft).

The island is an important landmark in the region often afflicted by fog, and is used for coastal boat navigation.

Sugar Loaf Island is located in the north-central part of Upernavik Archipelago, in the group between Kangerlussuaq Icefjord in the south, and Nuussuaq Peninsula in the north.

[1] The closest settlement is Nuussuaq, approximately 9.6 km (6.0 mi) to the north of the island.