Roman Catholic
- Archdiocese of Armagh (147 of 151 with times)
- Archdiocese of Cashel & Emly (86 of 86 with times)
- Archdiocese of Dublin (254 of 255 with times)
- Archdiocese of Tuam (98 of 106 with times)
- Diocese of Achonry (45 of 47 with times)
- Diocese of Ardagh & Clonmacnois (80 of 81 with times)
- Diocese of Clogher (86 of 87 with times)
- Diocese of Clonfert (46 of 48 with times)
- Diocese of Cloyne (111 of 111 with times)
- Diocese of Cork & Ross (119 of 122 with times)
- Diocese of Derry (101 of 102 with times)
- Diocese of Down & Connor (130 of 145 with times)
- Diocese of Dromore (30 of 32 with times)
- Diocese of Elphin (59 of 88 with times)
- Diocese of Ferns (100 of 102 with times)
- Diocese of Galway, Kilmacduagh and Kilfenora (68 of 71 with times)
- Diocese of Kerry (90 of 92 with times)
- Diocese of Kildare & Leighlin (113 of 117 with times)
- Diocese of Killala (43 of 46 with times)
- Diocese of Killaloe (131 of 136 with times)
- Diocese of Kilmore (94 of 95 with times)
- Diocese of Limerick (80 of 83 with times)
- Diocese of Meath (95 of 143 with times)
- Diocese of Ossory (88 of 89 with times)
- Diocese of Raphoe (70 of 71 with times)
- Diocese of Waterford & Lismore (89 of 89 with times)
Church of Ireland
- Diocese of Armagh (7 of 88 with times)
- Diocese of Cashel, Ferns & Ossory (3 of 148 with times)
- Diocese of Clogher (5 of 71 with times)
- Diocese of Connor (12 of 113 with times)
- Diocese of Cork, Cloyne & Ross (5 of 67 with times)
- Diocese of Derry & Raphoe (6 of 116 with times)
- Diocese of Down & Dromore (36 of 114 with times)
- Diocese of Dublin & Glendalough (13 of 113 with times)
- Diocese of Kilmore, Elphin & Ardagh (3 of 104 with times)
- Diocese of Meath & Kildare (2 of 60 with times)
- United Dioceses of Tuam, Limerick and Killaloe (9 of 92 with times)
Orthodox Churches
A diocese is listed here once it has 10 or more churches in this directory. Methodist and Presbyterian congregations are not organised into dioceses, so they are listed by town under Mass & service times and on their own denomination pages.