Whetter Nunatak (-66.9667°N 144°W) is a small rock outcrop on the coastal ice slopes near the sea, situated 8 nautical miles (15 km) east-northeast of Cape Denison on the east shore of Commonwealth Bay. Discovered by the Australasian Antarctic Expedition (1911–14) under Douglas Mawson, who named it for Dr. Leslie Whetter, a surgeon with the expedition.