Mesen (Messines in French, mostly used in English) is a municipality located in the Belgian province of West Flanders. The municipality only comprises the town of Mesen proper. On January 1 2006, Mesen had a total population of 988. The total area is 3.58 km² which gives a population density of 276 inhabitants per km².
Mesen is the smallest town in Belgium. It is a 'municipality with language facilities'.