Saint-Fabien () is a parish municipality in the Canadian province of Quebec, located in the Rimouski-Neigette Regional County Municipality.
In the 2021 Census of Population conducted by Statistics Canada, Saint-Fabien had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of , it had a population density of in 2021.
Population trend: