Järvenpää (Träskända in Swedish) is a town and municipality of Finland.

It is located in the province of Southern Finland and is part of the Uusimaa region. The municipality has a population of 37,114 (2003) and covers an area of 39.88 km² of which 2.42 km² is water. The population density is 930.6 inhabitants per km².

The municipality is unilingually Finnish.

It was the home of Jean Sibelius and his family from 1904. This timber-built villa "Ainola" was designed by the famous Finnish architect Lars Sonck. Its distance from the hustle and bustle of the nation’s capital gave the composer the peace that he needed for his creative endeavours, while other artistic families living in the neighbourhood provided a lively social circle.