The Diocese of Killaloe (/ˌkɪləˈluː/ kil-ə-LOO; Irish: Deoise Chill Dalua) 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 incumbent bishop of the diocese is Fintan Monahan.

The diocese is divided into 58 parishes, which are spread across five counties: 38 in Clare, thirteen in Tipperary, five in Offaly, one in Limerick, and one group parish in Laois.

[2] As of 2018, there were 90 priests in the diocese: 52 under and 38 over the mandatory retirement age of 75.

The following lists the ten most recent bishops:[5] This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed.