Ellef Ringnes Island is an uninhabited island and one of the Sverdrup Islands in the Qikiqtaaluk Region, Nunavut, Canada. A member of the Queen Elizabeth Islands and Arctic Archipelago, it is located in the Arctic Ocean, east of Borden Island, and west of Amund Ringnes Island. It has an area of 11,350.45 km2 (4,382.43 sq mi), making it the 68th largest island in the world and Canada's 16th largest island. Its highest mount is 260 m (850 ft).