The Big City Mayors' Caucus (BCMC) brings together mayors of Canada's 22 largest cities—including Toronto, Montreal, Vancouver, Calgary, Edmonton, Ottawa, and others—to collectively advocate to the federal government on urban issues. Operating as a subgroup within the Federation of Canadian Municipalities (FCM), the BCMC focuses on priorities specific to major cities such as transit infrastructure, affordable housing, immigrant settlement, and sustainable growth. The caucus leverages the combined population represented by member cities (approximately half of all Canadians) to push for federal policies and funding that address big city needs.