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.

[4] Population trend:[5] Private dwellings occupied by usual residents: 1,889 (total dwellings: 1,990) Mother tongue: Centre de services scolaire de Kamouraska - Rivière-du-Loup operates francophone public schools: The Eastern Shores School Board operates anglophone public schools: