Qullikorsuit Island is an uninhabited island in the Qaasuitsup municipality in northwestern Greenland. It is located in the northern part of Upernavik Archipelago. Qullikorsuit Island was inhabited between 1916, when the Appaalissiorfik settlement was founded, and 1923, when it was abandoned.
The island is mountainous throughout. At 822 m (2,697 ft), the Sullaussartooq mountain is the highest point on the island, with the top of the ridge permanently glaciated. The coastline of the island is generally undeveloped, despite two distinct peninsulas and shallow, unnamed bays in the south.