Saint-Fabien (French pronunciation: [sɛ̃ fabjɛ̃]) 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 1,834 living in 867 of its 1,171 total private dwellings, a change of -0.2% from its 2016 population of 1,837. With a land area of 119.92 km (46.30 sq mi), it had a population density of 15.3/km (39.6/sq mi) in 2021.

Population trend:

Census	Population	Change (%)
2021	1,834	0.2%
2016	1,837	3.6%
2011	1,906	2.4%
2006	1,952	5.6%
2001	1,848	0.5%
1996	1,838	0.9%
1991	1,822	10.0%
1986	2,024	2.9%
1981	2,084	1.7%
1976	2,119	10.9%
1971	2,378	7.1%
1966	2,561	20.1%
1961	3,207	4.6%
1956	3,067	9.8%
1951	2,793	8.6%
1941	2,571	6.0%
1931	2,426	11.2%
1921	2,182	10.1%
1911	1,981	0.4%
1901	1,989	0.3%
1891	1,994	9.8%
1881	1,816	7.1%
1871	1,695	29.5%
1861	1,309	N/A

• List of parish municipalities in Quebec

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