Sainte-Flavie (French pronunciation: [sɛ̃t flavi]) is a parish municipality in the La Mitis Regional County Municipality of Quebec, Canada, located on the south shore of the Saint Lawrence River, about 3 km (2 mi) northwest of Mont-Joli.

The inhabitants had to travel for miles to attend Sunday mass and to grind their grain at the mill on the Loutres River in Lessard.

Sainte-Flavie was named in honor of the co-seigneuress Flavie Drapeau and in memory of Flavia Domitilla, a Roman martyr of the 1st century.

The inhabitants of Sainte-Flavie wanted a stone church and after having made the request to the bishop and after having drawn up the plans and specifications, the construction begun.

[5] Mother tongue (2021):[9] Sainte-Flavie forms part of the federal electoral district of Avignon—La Mitis—Matane—Matapédia and has been represented by Kristina Michaud of the Bloc Québécois since 2019.

Provincially, L'Ascension is part of the Matane-Matapédia electoral district and is represented by Pascal Bérubé of the Parti Québécois since 2007.