| Saint-Léon-le-Grand | |
| Flag Size: | 120x80px |
| Pushpin Map: | Canada Eastern Quebec |
| Pushpin Map Caption: | Location in eastern Quebec. |
| Coordinates: | 48.3833°N -97°W |
| Subdivision Type: | Country |
| Established Title: | Settled |
| Established Date: | 1896 |
| Established Title1: | Constituted |
| Established Date1: | August 12, 1903 |
| Government Footnotes: | [1] |
| Leader Title: | Mayor |
| Leader Name: | Steve Lamontagne |
| Area Total Km2: | 128.50 |
| Area Land Km2: | 128.26 |
| Population Total: | 968 |
| Population Density Km2: | 7.5 |
| Population Blank1 Title: | Pop 2016-2021 |
| Population Blank1: | 1.6% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 447 |
| Utc Offset: | −5 |
| Utc Offset Dst: | −4 |
| Blank Name: | Highways |
Saint-Léon-le-Grand is a parish municipality in Quebec, Canada.
The territory was first a logging concession belonging to the Price company. The first settlers arrived in 1896 from Baie-des-Sables, Cap-Chat, Sainte-Félicité, Chicoutimi and Lac Saint-Jean. In the late 1880s, Jos Néron, François Gagné, Eusèbe Gagnon, Polyte Bouchard, Louis Girard, Henri Desbiens, Achille Potvin, Polyte Bouchard (the great) and Hector Desbiens were the first pioneers of the region. The Catholic mission was founded in 1901. Contrary to custom, the civil erection took place before the canonical erection of the parish. The municipality was officially founded civilly on August 12, 1903 while the parish was canonically established four years later, on December 9, 1907. However, the parish registers had been open since 1905. For its part, the post office was created in 1903. In 1941, a major fire broke out in a business and destroyed a dozen homes.
Saint-Léon-le-Grand is located on the southern slope of the St. Lawrence River, 430 km northeast of Quebec City and 110 km southeast of Rimouski. Important towns near Saint-Léon-le-Grand are Amqui at 12 km and Lac-au-Saumon at 16 km to the east. Causapscal at 27 km to the east as well as Sayabec at 33 km to the north. Saint-Léon-le-Grand is located on Route 195 halfway between Amqui and Saint-Zénon-du-Lac-Humqui. The territory of Saint-Léon-le-Grand covers an area of 127 km2. Most of this territory is mountainous and covered with forests.
The municipality of Saint-Léon-le-Grand is located in the regional county municipality (RCM) of La Matapédia in the administrative region of Bas-Saint-Laurent. The eponymous parish of Saint-Léon-le-Grand is located in the Roman Catholic Archdiocese of Rimouski and, more specifically, in the pastoral region of La Matapédia. Saint-Léon-le-Grand is part of the Gaspésie tourist region in the Matapédia Valley tourist sub-region.
In the 2021 Census of Population conducted by Statistics Canada, Saint-Léon-le-Grand had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of 128.26km2, it had a population density of in 2021.[2]