The Greenland Sea is a body of water that borders Greenland to the west, the Svalbard archipelago to the east, Fram Strait and the Arctic Ocean to the north, and the Norwegian Sea and Iceland to the south. The Greenland Sea is often defined as part of the Arctic Ocean, sometimes as part of the Atlantic Ocean. However, definitions of the Arctic Ocean and its seas tend to be imprecise or arbitrary. In general usage the term "Arctic Ocean" would exclude the Greenland Sea. In oceanographic studies the Greenland Sea is considered part of the Nordic Seas, along with the Norwegian Sea. The Nordic Seas are the main connection between the Arctic and Atlantic oceans and, as such, could be of great significance in a possible shutdown of thermohaline circulation. In oceanography the Arctic Ocean and Nordic Seas are often referred to collectively as the "Arctic Mediterranean Sea", a marginal sea of the Atlantic.

Greenland is a North American autonomous territory of the Kingdom of Denmark. It is the larger of two autonomous territories within the Kingdom, the other being the Faroe Islands; the citizens of both territories are full citizens of Denmark. As Greenland is one of the Overseas Countries and Territories of the European Union, citizens of Greenland are European Union citizens. The capital and largest city of Greenland is Nuuk. Greenland lies between the Arctic and Atlantic oceans, east of the Canadian Arctic Archipelago. It is the world's largest island, and is the location of the northernmost area of the world – Kaffeklubben Island off the northern coast is the world's northernmost undisputed point of land, and Cape Morris Jesup on the mainland was thought to be so until the 1960s.