Péruwelz is a Walloon municipality located in the Belgian province of Hainaut. On January 1, 2006, Péruwelz had a total population of 16,843. The total area is 60.56 km² which gives a population density of 278 inhabitants per km².
This municipality is more specifically situated in Western Hainaut, also called Walloon Picardy. Péruwelz is also near France, near the cities of "Condé-sur-l'Escaut", "Vieux Condé", "Hergnies", and is near the forest of Bon-Secours, the location of the castle of (l')Hermitage.