Saint-Janvier-de-Joly () is a municipality in Lotbinière Regional County Municipality in Quebec, Canada. It is part of the Chaudière-Appalaches region and had a population is 1,079 as of 2021.
It is named after Reverend Janvier Lachance, a missionary, who served the parish from 1914 to 1926. "Joly" honours Quebec Premier Henri-Gustave Joly de Lotbinière, the owner of the seigneurie of Lotbinière, which included Saint-Janvier-de-Joly.
The post office, opened in 1924, is called Joly, name under which the municipality is most commonly known.
References
Commission de toponymie du Québec Ministère des Affaires municipales, des Régions et de l'Occupation du territoire