The following is a list of Roman Catholic Bishops of the dioceses Limerick whose seat is now in St. John’s Cathedral.
- St Munchin d. 491 (Patron Saint of Limerick)
- Gilbert 1106 – 1138
- Patrick 1139
- Erolph 1140 – 1151
- Turgesius 1151 – 1167
- Brictius 1167 – 1195
- Donat O’Brien 1195 – 1207
- Geoffrey 1207 – 1215
- Edmund 1215 – 1222
- Hubert de Burgho 1223 – 1250
- Robert O’Neill 1251 – 1272
- Gerald le Mareschal 1272 – 1301
- Robert Dundonald 1302 – 1311
- Eustace de L’Eau 1311 – 1336
- Maurice Rochfort 1337 – 1353
- Stephen Lawless 1354 – 1359
- Stephen de Valle 1360 – 1369
- Perter Curragh 1369 – 1400
- Cornelius O’Dea 1400 – 1426
- John Mothel 1426 – 1458
- William Creagh 1459 – 1472
- Thomas Arthur 1472 – 1486
- Richard Stacpoole 1486
- John Dunow 1486 – 1489
- John Folan 1489 – 1521
- John Quin 1524 – 1551
- Hugh Lacy 1556 – 1579
- Cornelius O’Boyle 1582 – 1597
- Vicars 1597 – 1623
- Richard Arthur 1623 – 1646
- Edmund O’Dwyer 1646 – 1654
- Vicars 1654 – 1677
- James Dowley 1677 – 1685
- John Molon 1689 – 1702
- Cornelius O’Keeffe 1720 – 1737
- Robert Lacy 1738 – 1759
- Daniel Kearney 1759 – 1778
- Denis Conway 1779 – 1796
- John Young 1796 – 1813
- Charles Tuohy 1815 – 1828
- John Ryan 1828 – 1864 (Obituary Report)
- George Butler 1864 – 1886 (Obituary Report)
- Edward Thomas O’Dwyer 1886 – 1917 (Obituary Report)
- Denis Hallinan 1918 – 1923 (Obituary Report)
- David Keane 1924 – 1945
- Patrick O’Neill 1946 – 1958
- Henry Murphy 1958 – 1973
- Jeremiah Newman 1974 – 1995
- John Magee, Bishop of Cloyne and Apostolic Administrator of the Diocese of Limerick 1995 – 1996
- Donal Murray 1996 – Present