Tunu in the context of Administrative divisions of Greenland

The Eskaleut (/ɛˈskæliuːt/ e-SKAL-ee-oot), Eskimo–Aleut or Inuit–Yupik–Unangan languages are a language family native to the northern portions of the North American continent, and a small part of northeastern Asia. Languages in the family are indigenous to parts of what are now the United States (Alaska); Canada (Inuit Nunangat) including Nunavut, Northwest Territories (principally in the Inuvialuit Settlement Region), northern Quebec (Nunavik), and northern Labrador (Nunatsiavut); Greenland; and the Russian Far East (Chukchi Peninsula). The language family is also known as Eskaleutian, or Eskaleutic.

The Eskaleut language family is divided into two branches: Eskimoan and Aleut. The Aleut branch consists of a single language, Aleut, spoken in the Aleutian Islands and the Pribilof Islands. Aleut is divided into several dialects. The Eskimoan languages are divided into two branches: the Yupik languages, spoken in western and southwestern Alaska and in Chukotka, and the Inuit languages, spoken in northern Alaska, Canada and Greenland. Inuit languages are divided into several varieties. Neighbouring varieties are quite similar, although those at the farthest distances from the centre in the Diomede Islands and East Greenland are quite divergent.

Tunumiisut (lit. 'language of the Tunumiit'), also known as East Greenlandic (Danish: østgrønlandsk), is the language of the Tunumiit in East Greenland. It is generally categorised as a dialect of Greenlandic, but verges on being a distinct language. The largest town where it is the primary language is Tasiilaq on Ammassalik Island, with the island's name being derived from the West Greenlandic name of the town.