Ruin Island is a small island off the coast of the Inglefield Land region of northwest Greenland.

In the 1930s, Danish archaeologist Erik Holtved discovered the remains of human habitation on the island.

[1] Items traded by the Greenlandic Norse travelled as far as Ruin Island.

[2] The earliest known inhabitants of Ruin Island are ancestors of the Inuit known as Thule culture, named after the nearby archeologic site of Thule.

These Thule culture inhabitants have been estimated to arrive at Ruin Island between 1280 and 1330.