The Janssen Mill in Oirsbeek, Limburg, municipality of Beekdaelen, is a belt mill that was built in 1877-1878 and served as a wind-powered flour mill until the 1940s.
The mill is a national monument. In December 2011 Stichting Het Limburgs Landschap bought the Janssen mill from the then municipality of Schinnen for the symbolic amount of 1 euro because Het Limburgs Landschap took on the obligation to refurbish the mill again. In the past period, the mill has therefore undergone a major overhaul and now the mill is working again. The mill will now also be periodically opened to the public again.
The mill has a round brick-built hull with a wooden hood covered with roofing felt and has a radius of 24.8 meters. The mill is equipped with an English wheel wheel and porter and a Flemish catch (catch drum). The Janssenmolen is currently open to the public every 1st and 3rd Saturday of the month. When there is enough wind, Kollenberger Spelled is ground.