Saint-Denis (; ) 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.Arrêté royal du 18 février 1971 portant fusion des communes de Mons, Cuesmes, Ghlin, Hyon, Nimy et Obourg.
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