
Ireland is divided into four ecclesiastical provinces, each headed by a metropolitan archbishop. The island has 26 Catholic dioceses, each led by a bishop, including four metropolitan archdioceses. The dioceses are older than the counties in most cases. The Synod of Kells in 1152 established 36 dioceses under the four archdioceses of Armagh, Cashel, Dublin, and Tuam. The Church of Ireland has reduced its number of dioceses to 11, while the Catholic Church has 26, with some of them without a bishop.
| Characteristics | Values |
|---|---|
| Number of Catholic dioceses in Ireland | 26 |
| Number of bishops | 22 |
| Number of archbishops | 4 |
| Number of auxiliary bishops | 2 |
| Number of titular sees | 17 |
| Number of Eastern Catholic jurisdictions | 0 |
| Number of exempt ordinariates | 0 |
| Number of provinces | 4 |
| Number of parishes in Achonry | 23 |
| Number of priests in Achonry | 30 |
| Number of Catholics in Achonry | 37,000 |
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What You'll Learn
- The Synod of Kells in 1152 established 36 dioceses under four archdioceses
- Amalgamation of dioceses is being considered to reduce costs and pressure on finances
- The island of Ireland is divided into four ecclesiastical provinces, each headed by a metropolitan archbishop
- There are 26 dioceses in Ireland, each led by a diocesan bishop
- The boundaries of the Roman Catholic dioceses in Ireland do not conform with the political border

The Synod of Kells in 1152 established 36 dioceses under four archdioceses
The Synod of Kells in 1152 was a significant event in the history of the Catholic Church in Ireland, establishing 36 dioceses under four archdioceses: Armagh, Cashel, Dublin, and Tuam. This synod, or assembly of bishops, built upon the earlier work of the Synod of Rathbreasail in 1111, which had initiated the transition from a monastic system to a diocesan and parish-based structure.
The Synod of Kells was convened in response to the need to organise the Catholic Church in Ireland, which was facing challenges from Viking raids, secular impositions, and a decline in religious observance. By establishing 36 dioceses, the synod aimed to ensure that every diocese had access to a body of water as an escape route in turbulent times. This decision-making process set the groundwork for the territorial structure of the Catholic Church in Ireland, with the dioceses often older than the counties they are situated in.
The four archdioceses established at the Synod of Kells were Armagh, Cashel, Dublin, and Tuam. Armagh was granted primacy, and the diocese of Dublin, previously under the jurisdiction of Canterbury, was united with Glendalough. This reorganisation increased the number of metropolitan provinces from two to four.
The impact of the Synod of Kells lasted for centuries, with its diocesan structure largely surviving until the 16th century. Even today, it still influences the territorial organisation of both the Catholic Church and the Church of Ireland, although some modifications have been made. The number of dioceses has been reduced over time, with the Church of Ireland amalgamating its dioceses into 12, including two archdioceses.
In modern times, the Catholic Church in Ireland faces different challenges, including staff shortages and discussions around the potential amalgamation of dioceses to address these issues. Despite these changes, the Synod of Kells remains a pivotal moment in the history of the Catholic Church in Ireland, shaping its organisational structure and laying the foundation for its future development.
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Amalgamation of dioceses is being considered to reduce costs and pressure on finances
The Catholic Church in Ireland is divided into 26 dioceses, each led by a bishop. However, in April 2024, two west Ireland dioceses, Achonry and Killala, lost their bishops as part of a downsizing effort by the Catholic Church. This has been described as the most radical change to Irish church structures in over 900 years. The administration of these dioceses will be taken over by neighbouring bishops.
The reduction in the number of dioceses and bishops has been seen as inevitable due to the declining number of an ageing Catholic clergy. Ireland, with its 4.3 million Catholics, has 26 dioceses and as many bishops (plus Auxiliary Bishops). In contrast, the Catholic Archdiocese of Los Angeles, the largest Catholic diocese in the US, has just one archbishop and six auxiliary bishops serving over four million Catholics.
The issue of amalgamation has been raised previously, but met with resistance. The Church of Ireland has reduced its number of dioceses to 12, including two archdioceses, and there is ongoing discussion about amalgamating Tuam into another diocese, which would further reduce the number to 11. Amalgamation would reduce the cost of administration and pressure on finances, as well as reduce the number of bishops, which would speed up decision-making and ease the pressure on the dwindling talent pool.
The Synod of Kells in 1152 established 36 dioceses under four archdioceses: Armagh, Cashel, Dublin, and Tuam. The boundaries of these dioceses do not conform to the modern political border between the Republic of Ireland and Northern Ireland, with one archdiocese and three dioceses straddling the international border, and two dioceses wholly in Northern Ireland.
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The island of Ireland is divided into four ecclesiastical provinces, each headed by a metropolitan archbishop
The Synod of Rathbreasail in 1111 set up the diocesan system of Christian church government in Ireland, replacing the earlier Celtic Christian monastic model. This synod moved the Catholic Church in Ireland from a monastic system to a diocesan and parish-based structure. It established 36 dioceses under the four archdioceses of Armagh, Cashel, Dublin, and Tuam. The Synod of Kells in 1152 modified the structure, reducing the number of dioceses to 26.
The boundaries of the Roman Catholic dioceses in Ireland do not conform to the political border between the Republic of Ireland and Northern Ireland. One archdiocese and three dioceses straddle the international border, and two dioceses are wholly in Northern Ireland. The Diocese of Kilfenora, for example, is in the Ecclesiastical province of Cashel, and the Bishop of Galway and Kilmacduagh is its apostolic administrator rather than bishop.
There have been discussions about amalgamating some of the dioceses in Ireland to reduce administration costs and pressure on finances. The Church of Ireland has already reduced its number of dioceses to 11 or 12, depending on the source. In April 2024, two west Ireland dioceses, Achonry and Killala, lost their bishops, and it was announced that the dioceses would be administered by neighbouring bishops. This was described as the most radical change in Irish Catholic Church structures in over 900 years.
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There are 26 dioceses in Ireland, each led by a diocesan bishop
The 26 dioceses in Ireland include Achonry, Ardagh and Clonmacnois, Armagh, Cashel and Emly, Clogher, Clonfert, Cloyne, Cork and Ross, Derry, Down and Connor, Dromore, Dublin, Elphin, Ferns, Galway and Kilmacduagh, Kerry, Kildare and Leighlin, Killala, Killaloe, Kilmore, Limerick, Meath, Ossory, Raphoe, Tuam, Waterford, and Lismore. Each diocese is led by a diocesan bishop, and they are organised into a single all-island Episcopal Conference based in the primatial see of Armagh.
The Catholic Church in Ireland has been facing a shortage of bishops, with some dioceses currently without a bishop. This has resulted in the need for neighbouring bishops to take over the administration of these dioceses. Additionally, there have been discussions about amalgamating some dioceses to reduce the cost of administration and pressure on finances, as well as to speed up decision-making. However, there is resistance to this idea based on tradition and identity.
The boundaries of the Roman Catholic dioceses in Ireland do not conform to the political border between the Republic of Ireland and Northern Ireland. One archdiocese and three dioceses straddle the international border, while two dioceses are wholly in Northern Ireland. The Diocese of Kilfenora, for example, is in the Ecclesiastical province of Cashel, and the Bishop of Galway and Kilmacduagh is its apostolic administrator rather than a bishop.
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The boundaries of the Roman Catholic dioceses in Ireland do not conform with the political border
The island of Ireland is divided into four ecclesiastical provinces, each headed by a metropolitan archbishop. The country has 26 dioceses, each led by a diocesan bishop (including four Metropolitan Archdioceses). The entirety of Northern Ireland is covered by the ecclesiastical province of Armagh. The eponymous archdiocese and five of its suffragan dioceses cover the area of Northern Ireland.
Unlike many European countries, the boundaries of the Roman Catholic dioceses in Ireland do not conform with the political border between the Republic of Ireland and Northern Ireland. One archdiocese and three dioceses straddle the international border; two dioceses are wholly in Northern Ireland. The Metropolitan Archdiocese of Armagh includes parts of counties Armagh, Louth, Londonderry, and Tyrone. The Diocese of Clogher includes parts of counties Tyrone, Fermanagh, and Monaghan. The Diocese of Derry includes parts of counties Londonderry, Antrim, Donegal, and Tyrone. The Diocese of Kilmore includes parts of County Fermanagh.
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, replacing the earlier Celtic Christian monastic model. The dioceses are older than the counties in most cases, which is why no diocese in Ireland concurs with county boundaries. The Synod of Kells was intended to meet the needs of a very different Ireland. For instance, it was deemed wise that every diocese have access to a sea, river, or lake as an escape route.
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Frequently asked questions
There are 26 Catholic dioceses in Ireland.
There are 22 diocesan bishops in Ireland, with four archbishops and two auxiliary bishops, totalling 28.
No, the boundaries of the Roman Catholic dioceses in Ireland do not conform with the political border between the Republic of Ireland and Northern Ireland.
There are 17 titular sees in Ireland.





























