The Diocese of Killaloe is a Latin diocese of the Catholic Church in mid-western Ireland, one of six suffragan dioceses in the ecclesiastical province of Cashel and Emly.

The Archdiocese of Cashel and Emly is a Latin diocese of the Catholic Church located in mid-western Ireland, and the metropolis of the eponymous ecclesiastical province. The cathedral church of the archdiocese is the Cathedral of the Assumption in Thurles, County Tipperary. The incumbent archbishop, as of 2024, is Kieran O'Reilly.