Tabarin Peninsula (63°32′S 57°0′W / 63.533°S 57.000°WCoordinates: 63°32′S 57°0′W / 63.533°S 57.000°W) is a peninsula 15 nautical miles (28 km) long and 5 to 12 nautical miles (22 km) wide, lying south of the trough between Hope Bay and Duse Bay and forming the east extremity of Trinity Peninsula in the Antarctic Peninsula. It was discovered and charted by the Swedish Antarctic Expedition, 1901–1904, led by Otto Nordenskjöld and Carl Anton Larsen. It was mapped in 1946 by the Falkland Islands Dependencies Survey (FIDS) and named after Operation Tabarin, the naval code name for the FIDS from 1943 to 1945.
The Tabarin Peninsula extends from the northernmost point of the Antarctic Peninsula southwards into the Weddell Sea for about 25 km (16 mi). It is connected to the mainland by an isthmus about 12 km (7 mi) wide which lies between Hope Bay to the north and Duse Bay to the south. The average height of the peninsular is about 250 m (820 ft) and the highest point, at around 1,000 m (3,300 ft), is Mount Taylor which lies just north of the isthmus.