Nunatakassak (old spelling: Nunatakavsak) is a nunatak (Greenlandic: nunataq) in Avannaata municipality in northwestern Greenland. It is one of several nunataks in the Melville Bay region of Greenland, where the Greenland ice sheet (Greenlandic: Sermersuaq) drains into the bay alongside its entire length apart from an occasional nunatak.[1][2]