The Archdiocese of Armagh (Latin: Archidioecesis Ardmachana; Irish: Ard-Deoise Ard Mhacha) is a Roman Catholic archdiocese in the northern part of Ireland. The Ordinary is the Roman Catholic Archbishop of Armagh who is also the Metropolitan of the Ecclesiastical province of Armagh and the Primate of All Ireland. The mother church is St Patrick's Cathedral.