Laval is a city in Quebec, Canada. It is in the southwest of the province, north of Montreal. It is the largest suburb of Montreal, the third-larges…Laval is a city in Quebec, Canada. It is in the southwest of the province, north of Montreal. It is the largest suburb of Montreal, the third-largest city in the province after Montreal and Quebec City, and the thirteenth largest city in Canada, with a population of 443,192 in 2021.