Frederikssund Kommune (Danish pronunciation: [fʁeðʁekˈsɔnˀ kʰoˈmuːnə]) is a municipality (Danish: kommune) on the shores of Roskilde Fjord in the northern part of the island of Zealand (Sjælland) in eastern Denmark.

As of 1 January 2014 its mayor is John Schmidt Andersen, a member of the agrarian liberal Venstre political party.

The seat of its municipal council is the town of Frederikssund with a population of 15,283 (1 January 2009).

[2] The town is connected to the Hornsherred peninsula by the Kronprins Frederik bridge.

There are also ambitious plans to build a new residential development to the south of Frederikssund in Vinge north of Store Rørbæk.