Greenland is an autonomous territory in the Kingdom of Denmark. It is by far the largest geographically of three constituent parts of the kingdom; the other two are metropolitan Denmark and the Faroe Islands. It shares a small 1.2 km border with Canada on Hans Island. Citizens of Greenland are full citizens of Denmark and of the European Union. Greenland is one of the Overseas Countries and Territories of the European Union and is part of the Council of Europe. It is the world's largest island, and lies between the Arctic and Atlantic oceans, east of the Canadian Arctic Archipelago. Greenland's Kaffeklubben Island, off the northern coast, is the world's northernmost undisputed point of land—Cape Morris Jesup on the mainland was thought to be so until the 1960s. The capital and largest city is Nuuk. Economically, Greenland is heavily reliant on aid from Denmark, amounting to nearly half of the territory's total public revenue.

Though a part of the continent of North America, Greenland has been politically and culturally associated with the European kingdoms of Norway and Denmark for more than a millennium, beginning in 986. Greenland has been inhabited at intervals over at least the last 4,500 years by circumpolar peoples whose forebears migrated there from what is now Canada. Norsemen from Norway settled the uninhabited southern part of Greenland beginning in the 10th century (having previously settled Iceland), and their descendants lived in Greenland for 400 years until disappearing in the late 15th century. The 13th century saw the arrival of Inuit.

From the late 15th century, the Portuguese attempted to find the northern route to Asia, which ultimately led to the earliest cartographic depiction of its coastline. In the 17th century, Dano-Norwegian explorers reached Greenland again, finding their earlier settlement extinct and reestablishing a permanent Scandinavian presence on the island. When Denmark and Norway separated in 1814, Greenland was transferred from the Norwegian to the Danish crown. The 1953 Constitution of Denmark ended Greenland's status as a colony, integrating it fully into the Danish state. In the 1979 Greenlandic home rule referendum, Denmark granted home rule to Greenland. In the 2008 Greenlandic self-government referendum, Greenlanders voted for the Self-Government Act, which transferred more power from the Danish government to the local Naalakkersuisut (Greenlandic government). Under this structure, Greenland gradually assumed responsibility for a number of governmental services and areas of competence. The Danish government retains control of citizenship, monetary policy, security policies, and foreign affairs. With the melting of the ice due to global warming, its abundance of mineral wealth, and its strategic position between Eurasia, North America and the Arctic zone, Greenland holds strategic importance for the Kingdom of Denmark, NATO, and the EU.

Most residents of Greenland are Inuit. The population is concentrated mainly on the southwest coast, strongly influenced by climatic and geographical factors, and the rest of the island is sparsely populated. With a population of 56,583 (2022), Greenland is the least densely populated country in the world. Greenland is socially progressive, like metropolitan Denmark; education and healthcare are free, and LGBTQ rights in Greenland are some of the most extensive in the world. Sixty-seven percent of its electricity production comes from renewable energy, mostly from hydropower.

The early Norse settlers named the island Greenland. In the Icelandic sagas, the Norwegian Erik the Red was exiled from Iceland with his father, Thorvald, who had committed manslaughter. With his extended family and his thralls (slaves or serfs), he set out in ships to explore an icy land known to lie to the northwest. After finding a habitable area and settling there, he named it Grœnland (translated as "Greenland"), supposedly in the hope that the pleasant name would attract settlers. The Saga of Erik the Red states: "In the summer, Erik left to settle in the country he had found, which he called Greenland, as he said people would be attracted there if it had a favourable name."

The name of the territory in the Greenlandic language is Kalaallit Nunaat, 'land of the Kalaallit'. The Kalaallit are the Greenlandic Inuit who inhabit the territory's western region. The Greenlandic Inuit term Nunaat does not include waters and ice.

In prehistoric times, Greenland was home to several successive Palaeo-Inuit cultures known primarily through archaeological finds. The earliest entry of the Palaeo-Inuit into Greenland is thought to have occurred about 2500 BC. From about 2500 BC to 800 BC, southern and western Greenland was inhabited by the Saqqaq culture. Most finds of remains from that period have been around Disko Bay, including the site of Saqqaq, for which the culture is named.

From 2400 BC to 1300 BC, the Independence I culture existed in northern Greenland. It was a part of the Arctic small-tool tradition. Towns, including Deltaterrasserne, appeared. About 800 BC, the Saqqaq culture disappeared and the Early Dorset culture emerged in western Greenland and the Independence II culture in northern Greenland. It is unknown whether the Dorset people ever encountered the later Thule people. The people of the Dorset culture lived mainly by hunting whales and reindeer.