Boisbriand is an off-island suburb of Montreal, at the entrance of the Lower-Laurentides in southwestern Quebec, Canada, on the north sh…Boisbriand is an off-island suburb of Montreal, at the entrance of the Lower-Laurentides in southwestern Quebec, Canada, on the north shore of the Rivière des Mille Îles in the Thérèse-De Blainville Regional County Municipality.