Saint-Marc-sur-Richelieu (French pronunciation: [sɛ̃ maʁk syʁ ʁiʃ(ə)ljø], lit. 'Saint-Marc on Richelieu') is a municipality in southwestern Quebec, Canada, on the Richelieu River in the Regional County Municipality of La Vallée-du-Richelieu. The population as of the Canada 2021 Census was 2,245.

In its origin, the municipality was simply named: Saint-Marc. In 1921, the municipality lost an important part of its territory for the creation of the new municipality of Saint-Amable. In 1980, the municipality of Saint-Marc changed its name to the current name of Saint-Marc-sur-Richelieu.

On October 10, 2012, the municipality was reportedly the epicenter of an earthquake measuring 4.5 on the Richter scale.

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  Richelieu River
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  Parish Church Sign
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  Parish Church
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  Parish Priests Plaque
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  Maison Janotte, 1760
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  Maison Senecal-Moreau, 1762
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  Maison Isidore Blanchard, 1763
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  Hôtel Les Trois Tillleuls

• List of municipalities in Quebec