Ontario's Big City Mayors 

Ontario’s Big City Mayors (OBCM) is comprised of mayors of Ontario cities with populations of 100,000 or more. Collectively, Ontario’s Big City Mayors represent nearly 70% of Ontario’s population.

OBCM provides a voice for big city mayors in policy debates that impact Ontario cities. Through policy development, advocacy, discussion and partnerships, Ontario’s Big City Mayors support strong and effective cities.