Saint-Denis (French pronunciation: [sɛ̃ dəni] ; Walloon: Sint-Dnis) is a sub-municipality of the city of Mons located in the province of Hainaut, Wallonia, Belgium. It was a separate municipality until 1964. In 1964, it was merged into Obourg. On 1 January 1972, Obourg was merged into Mons.

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  Water mill (18th century).
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  Church.
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  The « Café de la Rampe ».
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  Pond.
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  Vineyard.
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  Abbey Farm.