Saint-Denis (Walloon: Sint-Dni) is a town of Wallonia and a district of the municipality of Mons, located in the province of Hainaut, Belgium.


It was a municipality until the fusion of the Belgian municipalities in 1977.


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50°29′00″N 4°01′00″E / 50.48333°N 4.01667°E / 50.48333; 4.01667