Hallett Peninsula () is a triangular, dome-shaped peninsula, 20 nautical miles (37 km) long, with 1,500 m cliffs on its E. seaboard side and 300 m on its west side. The peninsula extends from Cape Hallett to Cape Wheatstone and is joined to the mainland by a narrow ridge between Tucker Glacier and Edisto Inlet. So named by the New Zealand Geological Survey Antarctic Expedition (NZGSAE), 1957–58, because Hallett station on Seabee Hook was established at the north end of the peninsula.
This article incorporates public domain material from the United States Geological Survey document "Hallett Peninsula" (content from the Geographic Names Information System).