Cairn Island is one of the many uninhabited Canadian Arctic islands in the Qikiqtaaluk Region, Nunavut. It is a Baffin Island offshore island located in Frobisher Bay, 10.3 km (6.4 mi) southeast of the capital city of Iqaluit.

Other islands in the immediate vicinity include Aubrey Island, Beveridge Island, Bishop Island, Coffin Island, Crimmins Island, Emerick Island, Faris Island, Gardiner Island, Hill Island, Jenvey Island, Kudlago Island, Long Island, Mair Island, McLaren Island, Monument Island, Pichit Island, Ptarmigan Island, Qarsau Island, Sale Island, Sybil Island, and Thompson Island.