Artjärvi (Artsjö in Swedish) is a municipality of Finland.

It is located in the province of Southern Finland and is part of the Päijät-Häme region. The municipality has a population of 1570 and covers an area of 197,14 km² of which 20,57 km² is water. The population density is 8,8463 inhabitants per km².

The municipality is unilingually Finnish.

See also: Municipalities of Southern Finland