Saint-Esprit is a municipality in the Lanaudière region of Quebec, Canada, part of the Montcalm Regional County Municipality. It is located on both banks of the Saint-Esprit River, a tributary of the L'Assomption River.

Area codes 450, 579, and 354 are telephone area codes in the North American Numbering Plan in the Canadian province of Quebec, encompassing the off-island suburbs of Montreal, as well as the rest of the Montérégie region southward to the border with New York state. Among the cities in the numbering plan area are Laval, Longueuil, Terrebonne, Saint-Jean-sur-Richelieu, Brossard, Repentigny, Saint-Jérôme, Granby, Blainville and Saint-Hyacinthe.