Catholic Dioceses
in
Northern Ireland
Catholic DiocesesinNorthern Ireland | |
Former Jurisdiction | Type | Became |
| Ardstraw | Diocese | Now Diocese of Derry and Titular Episcopal See of Árd Sratha |
| Ardstraw | Abbacy nullius | Now Diocese of Derry and Titular Episcopal See of Árd Sratha |
| Armagh Armachan(us) | Archdiocese | Now Metropolitan Archdiocese of Armagh |
| Brefinnia Tybruinen(sis) | Diocese | Now Diocese of Kilmore |
| Brefinnia | Abbacy nullius | Now Diocese of Kilmore |
| Cinél nEógain and Ardstraw | Diocese | Now Diocese of Derry |
| Clogher Clogherien(sis) | Abbacy nullius | Now Diocese of Clogher |
| Derry | Abbacy nullius | Now Diocese of Derry |
| Down Dunen(sis) | Diocese | Now Diocese of Down and Connor |
| Down Dunen(sis) | Abbacy nullius | Now Diocese of Down and Connor |
| Dromore Dromoren(sis) | Abbacy nullius | Now Diocese of Dromore |
| Maghera, Cenél Fearadhaigh and Ardstraw | Diocese | Now Diocese of Derry |
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