Avallersuaq, old spelling Avatdlerssuaq, is an uninhabited island of the Cape Farewell Archipelago in Kujalleq municipality of southern Greenland.

It is a small and rocky island located east of Itilleq Island (Egger).

It has an elevation of 491 metres (1,611 ft).

[1] The small Saningassoq group of five islets lies to the north.

This Greenland location article is a stub.