Granby is a town in southwestern Quebec, located east of Montreal. The population as of the Canada 2011 Census was 63,433. Granby is the seat of La Haute-Yamaska Regional County Municipality. It is the fourth most populated town in Montérégie after Longueuil, Saint-Jean-sur-Richelieu, and Brossard. The town is named after John Manners, Marquess of Granby.