Castle Rock (77°48′S 166°46′E / 77.800°S 166.767°E / -77.800; 166.767) is a bold rock crag, 415 metres (1,362 ft) high, standing 3 nautical miles (5.6 km; 3.5 mi) northeast of Hut Point on the central ridge of Hut Point Peninsula, Ross Island, Antarctica.

It was discovered by the British National Antarctic Expedition, 1901–04, under Robert Falcon Scott, who so named it because of its shape.

[2] Castle Rock is part of the McMurdo Volcanic Group, a large group of Cenozoic alkaline volcanic rocks found from Cape Adare south to the Ross Ice Shelf in the West Antarctic Rift System.

Its distinct shape if mostly formed by hyaloclastite sequences, and is very similar to subglacial volcanoes found in Iceland and the Antarctic Peninsula.

The route may be used by hikers, runners or skiers, and is the most demanding in the McMurdo Station area on Ross island.