Until January 1, 2007 Jernløse municipality was a municipality (Danish, kommune) in northeastern West Zealand County on the island of Zealand (Sjælland) in Denmark. The municipality covered an area of 103 km², and had a population of 5,943 (2005). Its last mayor was Annica Granstrøm representing Venstre, Denmark's Liberal Party. The site of the municipal council was the town of Nørre Jernløse.