The Big City Mayors' Caucus is an organization of mayors from Canada's largest cities who meet regularly to discuss common challenges and advocate for urban interests with federal and provincial governments. Large cities share issues distinct from smaller communities, including public transit systems, homelessness, housing affordability, and infrastructure needs scaled to millions of residents. By speaking collectively, big-city mayors amplify their voice on federal policy matters affecting urban Canada. The caucus operates alongside the Federation of Canadian Municipalities, which represents municipalities of all sizes. Direct engagement between federal ministers and big-city mayors has become an important part of intergovernmental relations.