Horse Head Island (Greenlandic: Appalersalik, old spelling: Agpalersalik) is an uninhabited island in Avannaata municipality in northwestern Greenland.

Horse Head Island is an outlying island in Tasiusaq Bay, an indentation of Baffin Bay in the north-central part of Upernavik Archipelago. The closest island is Tuttorqortooq Island in the east.