Culbertson 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, southeast of the capital city of Iqaluit.

Culbertson Island is 3 mi (4.8 km) long, and 2 mi (3.2 km) wide. It is north-northwest of Gay Island. Other islands in the immediate vicinity include Low Island, Mark Island, McAllister Island, Peak Island, and Precipice Island.