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.

The Roman Catholic Archdiocese of Kingston is a Latin Church ecclesiastical jurisdiction or archdiocese of the Catholic Church in Canada that includes part of the federal Province of Ontario in southeastern Canada.