Saint-Barnabé-Sud (French pronunciation: [sɛ̃ baʁnabe syd]) is a municipality in southwestern Quebec in the Regional County Municipality of Les Maskoutains. The population as of the 2021 Canadian Census was 962. It is the birthplace of historian Jean-Baptiste-Arthur Allaire.

Historical Census Data - Saint-Barnabé-Sud, Quebec

Year Pop. ±% 1991 880 —     1996 902 +2.5% 2001 884 −2.0%

Year Pop. ±% 2006 864 −2.3% 2011 859 −0.6% 2016 861 +0.2%

Year Pop. ±% 2021 962 +11.7%

Canada Census Mother Tongue - Saint-Barnabé-Sud, Quebec
Census		Total		French				English				French & English				Other
Year		Responses		Count	Trend	Pop %		Count	Trend	Pop %		Count	Trend	Pop %		Count	Trend	Pop %
2021		965		920	9.5%	95.3%		10	100.0%	1.0%		5	50.0%	0.5%		15	200.0%	1.6%
2016		860		840	0.0%	97.7%		5	50.0%	0.6%		10	n/a%	1.2%		5	n/a%	0.6%
2011		850		840	2.9%	98.8%		10	n/a%	1.2%		0	0.0%	0.0%		0	0.0%	0.0%
2006		865		865	0.0%	100.0%		0	100.0%	0.0%		0	100.0%	0.0%		0	100.0%	0.0%
2001		895		865	0.0%	96.7%		10	50.0%	1.1%		10	n/a%	1.1%		10	n/a%	1.1%
1996		885		865	n/a	97.7%		20	n/a	2.3%		0	n/a	0.0%		0	n/a	0.0%

• Saint-Barnabé-Sud

On June 7, 2010, police reported that a 20-day-old infant in Saint-Barnabé-Sud had been killed by a dog, a Siberian Husky, that afternoon.

• List of municipalities in Quebec

• "Saint-Barnabé-Sud". Commission de toponymie. Retrieved June 7, 2010.
• Répertoire des municipalités du Québec
• Affaires municipales et régions - cartes régionales