Castle Island () is an island in far northern Greenland. Administratively it is part of the Northeast Greenland National Park.
Geography Castle Island is located in Saint Andrew Bay, east of Hendrik Island, in the mouth area of Sherard Osborn Fjord. It is separated from Hendrik Island by a wide sound. The northernmost headland of the island is Cape Cleveland and the southernmost Cape Gray.Greenland Pilot - Danish Geodata Agency
The island is unglaciated with two lakes between two mountain ridges.Sven Hedin Firn, Army Map Service, United States Army Corps of Engineers, Greenland 1:250,000 The peak in its eastern end reaches . The sea around the island is rarely free from ice.Prostar Sailing Directions 2005 Greenland and Iceland Enroute, p. 94
See also List of islands of Greenland References