Thurston Island (72°6′S 99°0′W / 72.100°S 99.000°W / -72.100; -99.000 (Thurston Island)) is a largely ice-covered, glacially dissected island, 135 nautical miles (250 km; 155 mi) long and 55 nautical miles (102 km; 63 mi) wide, lying between between Amundsen Sea and Bellingshausen Sea a short way off the northwest end of Ellsworth Land, Antarctica.
The island is separated from the mainland by Peacock Sound, which is occupied by the west portion of Abbot Ice Shelf.
