Duke of York Island is a mountainous ice-free island, 2.5 miles (4 km) long, lying in the southern part of Robertson Bay, Antarctica, along the northern coast of Victoria Land. It was first charted in 1899 by the British Antarctic Expedition, under Carsten Borchgrevink, who named it for the then Duke of York, later George V. This island lies situated within the borders known as the Pennell Coast, a portion of Antarctica lying between Cape Williams and Cape Adare.