Saint-Antonin (French pronunciation: [sɛ̃t‿ɑ̃tɔnɛ̃]) is a city in the Bas-Saint-Laurent region of Quebec, Canada, a few kilometres south of the city of Rivière-du-Loup, in Rivière-du-Loup Regional County Municipality. The municipality is named after Louis-Antonin or Antoine Proulx (1810-1896), priest of Fraserville (Rivière-du-Loup) and was founded in 1856.

On November 1, 2014, Saint-Antonin was changed from a parish municipality to a (regular) municipality.

Population trend:

• Population in 2021: 4,338 (2016 to 2021 population change: 7.1%)
• Population in 2016: 4,049
• Population in 2011: 4,027
• Population in 2006: 3,780
• Population in 2001: 3,395
• Population in 1996: 3,368
• Population in 1991: 3,268
• Population in 1986: 3,160
• Population in 1981: 3,075
• Population in 1976: 2,586
• Population in 1971: 2,243
• Population in 1966: 2,132
• Population in 1961: 1,983
• Population in 1956: 1,834
• Population in 1951: 1,632
• Population in 1941: 1,530
• Population in 1931: 1,409
• Population in 1921: 1,222
• Population in 1911: 1,271
• Population in 1901: 1,186
• Population in 1891: 1,079
• Population in 1881: 1,234
• Population in 1871: 1,185
• Population in 1861: 891

Private dwellings occupied by usual residents: 1,889 (total dwellings: 1,990)

Mother tongue:

• English as first language: 0.3%
• French as first language: 99.1%
• English and French as first language: 0.3%
• Other as first language: 0.2%

Centre de services scolaire de Kamouraska - Rivière-du-Loup operates francophone public schools:

• École Lanouette

The Eastern Shores School Board operates anglophone public schools:

• Metis Beach School in Métis-sur-Mer

• Répertoire des municipalités du Québec
• Commission de toponymie du Québec
• Affaires municipales et régions - cartes régionales

• Media related to Saint-Antonin, Quebec at Wikimedia Commons