List of the Roman Catholic dioceses of Ireland

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The diocesan system of Christian church government in Ireland was set up by the Synod of Rathbreasail in 1111 and modified by the Synod of Kells in 1152. The country is divided into four ecclesiastical provinces each headed by an archbishop. The provinces are in turn subdivided into suffragan dioceses each headed by a bishop. The only change in this system was the creation of the Diocese of Galway in 1831 following the abolition of the Wardenship of Galway, and the merging of some dioceses (these are the ones with more than one town in the name e.g. "Down and Connor".

[edit] List of Dioceses

Archdiocese of Armagh

Roman Catholic Diocese of Ardagh and Clonmacnoise
Roman Catholic Diocese of Clogher
Roman Catholic Diocese of Derry
Roman Catholic Diocese of Down and Connor
Roman Catholic Diocese of Dromore
Roman Catholic Diocese of Kilmore
Roman Catholic Diocese of Meath
Roman Catholic Diocese of Raphoe

Archdiocese of Cashel and Emly

Roman Catholic Diocese of Cloyne
Roman Catholic Diocese of Cork and Ross
Roman Catholic Diocese of Kerry
Roman Catholic Diocese of Killaloe
Roman Catholic Diocese of Limerick
Roman Catholic Diocese of Waterford and Lismore

Archdiocese of Dublin

Roman Catholic Diocese of Ferns
Roman Catholic Diocese of Kildare and Leighlin
Roman Catholic Diocese of Ossory

Archdiocese of Tuam

Roman Catholic Diocese of Achonry
Roman Catholic Diocese of Clonfert
Roman Catholic Diocese of Elphin
Roman Catholic Diocese of Galway, Kilmacduagh and Kilfenora
Roman Catholic Diocese of Killala

The ancient Diocese of Kilfenora, in the ecclesiastical province of Cashel, has been administered by the Bishop of Galway, in the province of Tuam, since the late 19th century. The correct title is Bishop of Galway and Kilmacduagh and Apostolic Administrator of Kilfenora. The Diocese of Ross was merged with the Diocese of Cork in the 1950s.

The Archbishop of Cashel and Emly resides in Thurles.