Lummen is a municipality located in the Belgian province of Limburg near Hasselt. On January 1, 2006, Lummen had a total population of 13,691. The total area is 53.38 km² which gives a population density of 256 inhabitants per km².
The municipality consists of the following sub-municipalities: Lummen proper, Meldert en Linkhout. In addition, it includes the following hamlets: Geneiken, Genenbos, Gestel, Goeslaar, Groenlaren, Laren, Mellaer, Molem, Oostereinde, Rekhoven, Schalbroek, and Thiewinkel.
Kasteel Lagendal is situated in this municipality.
The historic coat of arms features the crests of the Houses of Arenberg, La Marck and Arrazola de Oñate. In 2008 however, the municipality chose to use a new logo on its official documents instead.