Inussulik Bay (Greenlandic: Inussullip Imaa, old spelling: Inugsugdlip Imâ) is a bay in the Upernavik Archipelago in the Qaasuitsup municipality in northwestern Greenland.
The bay is located in the northern part of Upernavik Archipelago, between Kiatassuaq Island in the north and Nuussuaq Peninsula in the south. It is an arch-shaped indentiation of Baffin Bay, sometimes included as part of Melville Bay, although commonly the southern limit of latter is defined as Wilcox Head, the western cape of Kiatassuaq Island.
At its widest − from the Wilcox Head promontory on Kiatassuaq Island to the Tinumanersuaq cape on Nuussuaq Peninsula − Inussulik Bay stretches for 43.12 km (26.79 mi). The length of the bay reaches its maximum of 40.6 km (25.2 mi) at the point where the Greenland ice sheet (Greenlandic: Sermersuaq) drains into the bay via the Illullip Sermia glacier.
Kiatassuaq Island is the largest island in the bay, forming its northern boundary. Unlike the neighboring Melville Bay in the north and Sugar Loaf Bay in the south, Inussulik Bay has few islands. There are only five small islands, all uninhabited, as well as several skerries in the eastern part.
The main island is the 6.3 km × 1.9 km (3.9 mi × 1.2 mi) Inussullissuaq Island in the north. In 1930 the island briefly served as a polar station for Knud Rasmussen, the Greenlandic polar explorer and anthropologist. The station was named Bjørne Borg (or Bjørneborg, a bear castle). Its ruins can still be found on the island.