Sainte-Hélène-de-Mancebourg is a parish municipality in northwestern Quebec, Canada in the Abitibi-Ouest Regional County Municipality. It covers 68.15 km and had a population of 410 as of the 2021 Canadian census. The municipality was created in 1941.

The name Sainte-Hélène-de-Mancebourg recalls the memory of two women, Helena, mother of Constantine I, and Jeanne Mance. Saint Helena's greatest claim to fame is the discovery of the True Cross during a trip to the Holy Places in 326, according to a widespread legendary tradition. Jeanne Mance co-founded the city of Montreal. The ‘bourg’ element underlines the presence of an inhabited core on the territory.

Sainte-Hélène-de-Mancebourg was founded on May 10, 1941.

In the 2021 Census of Population conducted by Statistics Canada, Sainte-Hélène-de-Mancebourg had a population of 410 living in 159 of its 185 total private dwellings, a change of 9.9% from its 2016 population of 373. With a land area of 68.15 km (26.31 sq mi), it had a population density of 6.0/km (15.6/sq mi) in 2021.

Historical census populations – Sainte-Hélène-de-Mancebourg

Year Pop. ±% 1941 419 —     1951 560 +33.7% 1956 612 +9.3% 1961 587 −4.1% 1966 562 −4.3% 1971 491 −12.6% 1976 457 −6.9% 1981 454 −0.7%	Year Pop. ±% 1986 436 −4.0% 1991 398 −8.7% 1996 415 +4.3% 2001 384 −7.5% 2006 375 −2.3% 2011 354 −5.6% 2016 373 +5.4% 2021 410 +9.9%
Source: Statistics Canada

Private dwellings occupied by usual residents (2021): 159 (total dwellings: 185)

Mother tongue (2021):

• English as first language: 0%
• French as first language: 98.8%
• English and French as first language: 1.2%
• Other as first language: 0%

Municipal council (as of 2023):

• Mayor: Rémi Morin
• Councillors: Florent Bédard, Ghislain Gagné, Monia Cloutier, Claudette Bédard, Raymonde Petitclerc, Yvon Morin

List of former mayors:

• Official website