Bellechasse Regional County Municipality (French pronunciation: [bɛlʃas]) is a regional county municipality in the Chaudière-Appalaches region of Quebec. The county seat is Saint-Lazare-de-Bellechasse.

Saint-Lazare was chosen as the county seat because of its central location. Other municipalities, such as Saint-Anselme, Sainte-Claire, and Saint-Damien had wanted to be the county seat because of their larger population. The region belongs to the Lévis—Bellechasse federal electoral district.

There are 20 subdivisions within the RCM:

(Statistics Canada, 2016)

• Population: 37,233
• Population change (2011-2016): +5.4
• Dwellings: 17,740
• Area (km²): 1,751.06
• Population Density (per km².): 21.3

Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:

• Beaumont Mill, 1821 (Beaumont)
• Ferme Appalaches Safari Ranch (Saint-Lazare)
• Gold Museum (Saint-Philémon)
• Horse-drawn carriages Museum (Saint-Vallier)
• Le Ricaneux Artisanal Wine (Saint-Charles)
• Massif du Sud Ski Area (Saint-Philémon)
• Notre-Dame-de-Perpetual-Secours Historical Centre (Saint-Damien-de-Buckland)

• Massif du Sud Regional Park
• St-Vallier National Migratory Bird Sanctuary

• List of regional county municipalities and equivalent territories in Quebec
• Sisters of Our Lady of Perpetual Help, Bellechasse