Mesen (Messines in French, historically used in English) is a city located in the Belgian province of West Flanders. 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.
The municipality comprises only one main settlement, the town of Mesen proper. An exclave to the west of the main territory is surrounded by the municipalities of Heuvelland and Comines-Warneton.
The territory of Mesen (marked 'I') and its immediate neighbours. Built-up areas are shown in yellow.