St. Michael's Cathedral Basilica is the cathedral church of the Roman Catholic Archdiocese of Toronto, Canada, and one of the oldest churches in Toronto. It is located at 65 Bond Street in Toronto's Garden District. St. Michael's was designed by William Thomas, designer of eight other churches in the city, and was primarily financed by Irish immigrants who resided in the area. The cathedral has a capacity of 1600. John Cochrane and Brothers undertook the work on the stone and stucco ornamentation of the interior.

The Metropolitan Archdiocese of Toronto is a Roman Catholic archdiocese that includes part of the province of Ontario. Its archbishop is also the ecclesiastical provincial for the dioceses of Hamilton, London, Saint Catharines, and Thunder Bay. The Archbishop is Francis Leo, appointed in February 2023.