Kiatak or Northumberland Island (Danish: Northumberland Ø), also known as Kujata, is an island off the coast of northern Greenland.

[2] The latter is the smallest of the group and lies off Kiatak's western shore.

The islands lie off the Inglefield Fjord, between the Murchison Sound to the north and the Hvalsund to the south.

[3] The island has been designated an Important Bird Area (IBA) by BirdLife International because it supports a breeding population of some 2.5 million pairs of little auks, as well as other seabird species.

[4] The island was inhabited at the time of Robert Peary's Greenland expeditions in 1886 and 1891–1897.