The Archdiocese of Cashel and Emly (Irish: Ard-Deoise Chaisil agus Imligh) is a Roman Catholic archdiocese in mid-western Ireland. The archdiocese is led by the Archbishop of Cashel and Emly who serves as pastor of the mother church the Cathedral of the Assumption and Metropolitan of the Metropolitan Province of Cashel. The Diocese of Cashel was established in 1111 by the Synod of Rathbreasail.