Enontekiö is a municipality in the Finnish part of Lapland with approx. 1,800 inhabitants. It is situated in the outermost northwest of the country and occupies a large and very sparsely populated area of about 8,400 square kilometres (3,200 sq mi) between the Swedish and Norwegian border. Finland's highest point, the Halti fell with a height of 1,324 metres (4,344 ft) above the mean sea level, lies in the north of Enontekiö, where the municipality occupies a part of the Scandinavian Mountains. The administrative centre of Enontekiö is the village of Hetta. About one fifth of the community's population are Sami people. Enontekiö's main industries are tourism and reindeer husbandry.

Enontekiö is located in the region of Lapland in the outermost northwest tip of Finland. The bulge between Swedish and Norwegian border, which is occupied by the municipality of Enontekiö, is called Käsivarsi (Finnish for "arm"), because before World War II, Finland's borders had the shape of a woman's figure (Suomi-neito) and the area looked like her raised right arm. The municipality occupies a large and sparsely populated area of 8,391.35 km2 (3,239.92 sq mi) (more than three times the area of Luxembourg). Thus Enontekiö is Finland's third-largest municipality in size, after Inari and Sodankylä, and with a population density of only 0.23/km² (0.60/sq mi), it is the second-most sparsely populated municipality, after Savukoski.

Enontekiö's neighbouring municipalities are Inari in the east, Kittilä in the southeast, and Muonio in the south; on the Swedish side in the west, there is the municipality of Kiruna and on the Norwegian side in the north, there are Storfjord, Gáivuotna (Kåfjord), Nordreisa, and Kautokeino. Enontekiö shares a border of more than 450 kilometres (280 mi) with the two adjacent states. The border to Sweden is formed by the river Muonionjoki and its tributary, Könkämäeno.