 Roman Catholic Archdiocese of Ottawa–Cornwall

The Roman Catholic Archdiocese of Ottawa–Cornwall (, ) is a Catholic archdiocese that includes part of the Province of Ontario and includes the suffragan dioceses of Hearst, Pembroke, and Timmins.On 6 May 2020, Pope Francis merged the Archdiocese of Ottawa and the Diocese of Alexandria-Cornwall to create the Archdiocese of Ottawa–Cornwall.