Princess Dagmar Island (Danish: Prinsesse Dagmar Ø) is an uninhabited coastal island of the Wandel Sea in King Frederick VIII Land, Greenland.

The Danish military base/weather station Nord is located in the mainland east of the island, on the western side of Crown Prince Christian Land Peninsula.

[1] Princess Dagmar Island is located to the southeast of Princess Thyra Island and to the south of Princess Margaret Island, close to the coast of Crown Prince Christian Land in far northeastern Greenland.

[2] The island has an area of 144.5 km ² and has a shoreline of 55,8 kilometres.

[4] The island is presently within the Northeast Greenland National Park.