Saint-Mathieu-de-Beloeil (French pronunciation: [sɛ̃ matjø də bɛlœj]) is a municipality in southwestern Quebec, Canada, east of Montreal in the Regional County Municipality of La Vallée-du-Richelieu.

The population as of the 2021 Canadian Census was 2,952.

Population trend:[5] Mother tongue language (2021)[6]

The South Shore Protestant Regional School Board previously served the municipality.

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