Saint-Mathieu-d'Harricana is a municipality in the Canadian province of Quebec, located in the Abitibi Regional County Municipality. It is part of the census agglomeration of Amos.

In the 2021 Census of Population conducted by Statistics Canada, Saint-Mathieu-d'Harricana had a population of 770 living in 318 of its 349 total private dwellings, a change of 4% from its 2016 population of 739. With a land area of 105.86 km (40.87 sq mi), it had a population density of 7.3/km (18.8/sq mi) in 2021.

As of the 2021 census, mother tongues spoken are:

• English as first language: 1.3%
• French as first language: 97.4%
• English and French as first language: 0%
• Other as first language: 1.3%

Historical census populations – Saint-Mathieu-d'Harricana

Year Pop. ±% 1951 465 —     1956 478 +2.8% 1961 478 +0.0% 1966 441 −7.7% 1971 399 −9.5% 1976 406 +1.8% 1981 549 +35.2% 1986 611 +11.3%	Year Pop. ±% 1991 655 +7.2% 1996 717 +9.5% 2001 700 −2.4% 2006 716 +2.3% 2011 696 −2.8% 2016 739 +6.2% 2021 770 +4.2%
Population figures based on revised counts. Source: Statistics Canada

Municipal council (as of 2023):

• Mayor: Martin Roch
• Councillors: Miguel Roy, Simon Roy, Éric Arseneault, Lucie Crépeault, Guillaume Bergeron, Sébastien Morand

• Media related to Saint-Mathieu-d'Harricana at Wikimedia Commons
• Official website