Hall Island is a small island located 3.5 miles (5.6 km) to the northwest of St. Matthew Island in the Bering Sea in Alaska, United States. It serves as a haulout site for Pacific walrus. It is 5 miles (8.0 km) in length and has a land area of 6.1758 square miles (15.995 km²). The highest point is 1,610 feet (490 m). Hall Island is uninhabited. It is part of the Bering Sea unit of the Alaska Maritime National Wildlife Refuge.