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Messancy (German: Metzig, Luxembourgish: Miezeg, Walloon: Messanceye) is a Walloon municipality of Belgium located in the province of Luxembourg.
On 1 January 2007 the municipality, which covers 52.43 km², had 7,466 inhabitants, giving a population density of 142.4 inhabitants per km².
The commune of Messancy is composed of many villages : Wolkrange, Guelff, Sélange, Hondelange, Turpange, Bébange, Longeau, Habergy, Differt.
Les Insoumis, whose provincial leader Pierre Luttgens died on 4 september 1944 (Athus).