Ulak Island (Aleut: Yuulax̂) is an island in the Delarof Islands subgroup of the Andreanof Islands in the Aleutian Islands chain of Alaska.

Ulak is roughly 4 miles (6.4 kilometres) northeast of Amatignak Island.

• B. A. Drummond, B. A. und A. L. Larned: Biological monitoring in the central Aleutian Islands, Alaska in 2007: summary appendices. U.S. Fish and Wildlife Service Report AMNWR 07/06. Homer, Alaska, 2007

51°21′54″N 178°56′50″W / 51.36500°N 178.94722°W / 51.36500; -178.94722