Jarfalla Municipality (Jarfalla kommun) is a municipality in Stockholm County in east central Sweden, and is considered a suburb of Stockholm. Its seat is located in Jakobsberg, part of the Stockholm urban area.
Jarfalla has not been amalgamated with other municipalities in the two local government reforms carried out during the 20th century. The Stäket area in the north was, however, added in 1952.
It is located about 20 km north of Stockholm, with a part situated by the shore of Lake Malaren. It takes about 20 minutes to reach downtown Stockholm by Stockholm commuter rail.