Adugak Island (also spelled Adougakh, possibly from Aleut: Adudak) is a small island in the Fox Islands group in the Aleutian Islands of southwestern Alaska. It is about 1.2 miles (2 km) long and is located 5.0 miles (8 km) off the northwest coast of Umnak Island. The island has been protected as a rookery for the endangered steller sea lion, which has been observed during the winter feeding on the fish that inhabit the water nearby.