| Bishops of Clonfert (Roman Rite) |
 Bishop Michael Duignan (54)
(2019.07.16 – ...)
Bishop of Galway and Kilmacduagh (Ireland)
Bishop of Clonfert (Ireland)
Respicite ad eum et illuminamini |
 Bishop John Kirby (86)
(1988.02.18 – 2019.07.16)
Bishop emeritus of Clonfert (Ireland)
Crióst linn | Born: | 1938.10.29 (Athlone, Ireland) | | Ordained Priest: | 1963.06.23 | | Consecrated Bishop: | 1988.04.09 |
| Priest of Clonfert (Ireland) (1963.06.23 – 1988.02.18) Bishop of Clonfert (Ireland) (1988.02.18 – 2019.07.16) |
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Bishop Joseph Cassidy (later Archbishop)
(1982.05.01 – 1987.08.22) Le caoineas Chríost | Born: | 1933.10.29 (Charlestown, Ireland) | | Ordained Priest: | 1959.06.21 | | Consecrated Bishop: | 1979.09.23 | | Died: | 2013.01.31 († 79) |
| Coadjutor Bishop of Clonfert (Ireland) (1979.08.24 – 1982.05.01) Bishop of Clonfert (Ireland) (1982.05.01 – 1987.08.22) Metropolitan Archbishop of Tuam (Ireland) (1987.08.22 – 1994.06.28) Apostolic Administrator of Tuam (Ireland) (1994.06.28 – 1995.01.17) |
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Bishop Thomas Ryan
(1963.05.09 – 1982.05.01) | Born: | 1915.02.08 | | Ordained Priest: | 1938.07.10 | | Consecrated Bishop: | 1963.06.16 | | Died: | 1983.08.20 († 68) |
| Bishop of Clonfert (Ireland) (1963.05.09 – 1982.05.01) |
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Bishop William J. Philbin
(1953.12.22 – 1962.06.05) | Born: | 1907.01.26 | | Ordained Priest: | 1931.06.21 | | Consecrated Bishop: | 1954.03.14 | | Died: | 1991.08.23 († 84) |
| Bishop of Clonfert (Ireland) (1953.12.22 – 1962.06.05) Bishop of Down and Connor (Northern Ireland) (1962.06.05 – 1982.08.24) |
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Bishop John Dignan
(1924.03.24 – 1953.04.12) | Born: | 1880.06.13 | | Ordained Priest: | 1903.09.07 | | Consecrated Bishop: | 1924.06.01 | | Died: | 1953.04.12 († 72) |
| Bishop of Clonfert (Ireland) (1924.03.24 – 1953.04.12) |
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Bishop Thomas O’Doherty
(1919.07.03 – 1923.07.13) | Born: | 1877.11.21 | | Ordained Priest: | 1902.06.22 | | Consecrated Bishop: | 1919.09.14 | | Died: | 1936.12.15 († 59) |
| Bishop of Clonfert (Ireland) (1919.07.03 – 1923.07.13) Bishop of Galway and Kilmacduagh (Ireland) (1923.07.13 – 1936.12.15) |
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Bishop Thomas P. Gilmartin (later Archbishop)
(1909.12.18 – 1918.07.10) | Born: | 1861.05.18 | | Consecrated Bishop: | 1910.02.13 | | Died: | 1939.10.14 († 78) |
| Bishop of Clonfert (Ireland) (1909.12.18 – 1918.07.10) Metropolitan Archbishop of Tuam (Ireland) (1918.07.10 – 1939.10.14) |
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Bishop Thomas O’Dea
(1903.06.10 – 1909.04.29) | Born: | 1858.01.07 | | Ordained Priest: | 1882.06.25 | | Consecrated Bishop: | 1903.08.30 | | Died: | 1923.04.09 († 65) |
| Bishop of Clonfert (Ireland) (1903.06.10 – 1909.04.29) Bishop of Galway and Kilmacduagh (Ireland) (1909.04.29 – 1923.04.09) |
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Bishop John Healy (later Archbishop)
(1896.11.02 – 1903.02.13) | Born: | 1841.01.02 | | Ordained Priest: | 1867.09 | | Consecrated Bishop: | 1884.08.31 | | Died: | 1918.03.19 († 77) |
| Titular Bishop of Macri (1884.06.27 – 1896.11.02) Coadjutor Bishop of Clonfert (Ireland) (1884.06.27 – 1896.11.02) Bishop of Clonfert (Ireland) (1896.11.02 – 1903.02.13) Metropolitan Archbishop of Tuam (Ireland) (1903.02.13 – 1918.03.19) |
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Bishop Patrick Duggan
(1871.10.02 – 1896.11.02) | Born: | 1813.11.10 (Ireland) | | Ordained Priest: | 1841.06.05 | | Consecrated Bishop: | 1872.01.14 | | Died: | 1896.11.02 († 82) |
| Bishop of Clonfert (Ireland) (1871.10.02 – 1896.11.02) |
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Bishop John Derry
(1847.07.09 – 1870.06.28) | Born: | 1811.06.19 | | Consecrated Bishop: | 1847.09.21 | | Died: | 1870.06.28 († 59) |
| Bishop of Clonfert (Ireland) (1847.07.09 – 1870.06.28) |
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Bishop Thomas Coen
(1831.10.09 – 1847.04.25) | Born: | (Ireland) | | Consecrated Bishop: | 1816.05.05 | | Died: | 1847.04.25 |
| Titular Bishop of Milevum (1816.01.26 – 1831.10.09) Coadjutor Bishop of Clonfert (Ireland) (1816.01.26 – 1831.10.09) Bishop of Clonfert (Ireland) (1831.10.09 – 1847.04.25) |
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Bishop Thomas Costello
(1786.07.06 – 1831.10.09) | Born: | 1744 | | Ordained Priest: | 1767.12 | | Died: | 1831.10.09 († 86) |
| Titular Bishop of Ænos (1786.06.30 – 1786.07.06) Coadjutor Bishop of Clonfert (Ireland) (1786.06.30 – 1786.07.06) Bishop of Clonfert (Ireland) (1786.07.06 – 1831.10.09) |
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Bishop Andrew O’Donnellan
(1778.05.07 – 1786.07.06) | Coadjutor Bishop of Clonfert (Ireland) (1776.12.01 – 1778.05.07) Titular Bishop of Antiphellus (1776.12.20 – 1778.05.07) Bishop of Clonfert (Ireland) (1778.05.07 – 1786.07.06) |
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Bishop Peter O’Donnellan
(1733.08.11 – 1778.05.07) | Born: | 1678 | | Died: | 1778.05.07 († 99) |
| Bishop of Clonfert (Ireland) (1733.08.11 – 1778.05.07) |
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Bishop Edmund Kelly
(1718.02 – 1733) | Consecrated Bishop: | 1718.05.14 | | Died: | 1733 |
| Bishop of Clonfert (Ireland) (1718.02 – 1733) |
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Bishop Ambrose O’Madden
(1713.09.15 – 1715.07) | Born: | 1641 | | Ordained Priest: | 1666 | | Consecrated Bishop: | 1714.04.15 | | Died: | 1715.07 († 73) |
| Bishop of Clonfert (Ireland) (1713.09.15 – 1715.07) |
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Bishop Maurice Donnellan
(1695.11.14 – 1706.07.02) | Bishop of Clonfert (Ireland) (1695.11.14 – 1706.07.02) |
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Bishop Thady Keogh, O.P.
(1671.07.13 – 1687) | Consecrated Bishop: | 1671.11.29 | | Died: | 1687 |
| Bishop of Clonfert (Ireland) (1671.07.13 – 1687) |
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Bishop Walter Lynch
(1647.03.11 – 1663.07.14) | Consecrated Bishop: | 1648.04.19 | | Died: | 1663.07.14 |
| Bishop of Clonfert (Ireland) (1647.03.11 – 1663.07.14) |
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Bishop John de Burgo (later Archbishop)
(1641.09.16 – 1647.03.11) | Consecrated Bishop: | 1642.05.29 | | Died: | 1667.04.04 |
| Bishop of Clonfert (Ireland) (1641.09.16 – 1647.03.11) Metropolitan Archbishop of Tuam (Ireland) (1647.03.11 – 1667.04.04) |
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Bishop Tadeo O’Farrell, O.P.
(1587.06.08 – 1602) | Consecrated Bishop: | 1587.08.30 | | Died: | 1602 |
| Bishop of Clonfert (Ireland) (1587.06.08 – 1602) Auxiliary Bishop of Sigüenza (Spain) (1589 – 1599) |
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Bishop Roland de Burgo
(1534.05.18 – 1580.06.20) | Consecrated Bishop: | 1537.06.10 | | Died: | 1580.06.20 |
| Bishop of Clonfert (Ireland) (1534.05.18 – 1580.06.20) |
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Bishop Denis O’More, O.P.
(1509.11.07 – 1534) | Bishop of Clonfert (Ireland) (1509.11.07 – 1534) |
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Bishop David de Burgo
(1508.07.05 – 1509) | Bishop of Clonfert (Ireland) (1508.07.05 – 1509) |
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Bishop Matthaeus Mág Raith, O.E.S.A.
(1463.06.22 – 1507) | Bishop of Clonfert (Ireland) (1463.06.22 – 1507) |
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Bishop Cornelius Ó Cuinnlis, O.F.M.
(1448.08.30 – 1463) | Bishop of Emly (Ireland) (1444 – 1448.08.30) Bishop of Clonfert (Ireland) (1448.08.30 – 1463) |
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Bishop Conchobair Ó Maolalaidh, O.F.M.
(1447.05.22 – 1448.08.30) |
Bishop John White, O.F.M.
(1441.10.25 – 1448.07 not possessed) Bishop of Clonfert (Ireland) (1441.10.25 – 1448.07 not possessed) |
Bishop Seaán Ó hEidhin, O.F.M.
(1438.07.18 – 1459) | Bishop of Clonfert (Ireland) (1438.07.18 – 1459) |
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Bishop Tomás mac Muircheartaigh Ó Cellaigh (Thomas O’Kelly), O.P.
(1405.03.11 – 1438.07.15) |
Bishop Énri Ó Connmaigh
(1398.07 – 1405.03.11) |
Fr. David Corre, O.F.M.
(1398.03.20 – 1398 not possessed) Bishop of Clonfert (Ireland) (1398.03.20 – 1398 not possessed) |
Archbishop Uilliam Ó Cormacáin
(1393.01.27 – 1398) Metropolitan Archbishop of Tuam (Ireland) (1386.05.05 – 1393.01.27) Bishop of Clonfert (Ireland) (1393.01.27 – 1398) |
Bishop Muircheartach mac Pilib O Cellaigh (later Archbishop)
(1378 – 1393.01.26) | Consecrated Bishop: | 1378 | | Died: | 1407.09.29 |
| Bishop of Clonfert (Ireland) (1378 – 1393.01.26) Metropolitan Archbishop of Tuam (Ireland) (1393.01.26 – 1407.09.29) |
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Bishop Tomás mac Gilbert Ó Cellaigh (Thomas O’Kelly)
(1347 – 1378) | Bishop of Clonfert (Ireland) (1347 – 1378) |
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Bishop Seoán Ó Leaáin
(1322.08.06 – 1336.04.07) | Consecrated Bishop: | 1322.09.20 | | Died: | 1336.04.07 |
| Bishop of Clonfert (Ireland) (1322.08.06 – 1336.04.07) |
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Bishop Robert Petit, O.F.M.
(1320.02.10 – 1321) |
Bishop Gregorius Ó Brócaig
(1308 – 1319) | Bishop of Clonfert (Ireland) (1308 – 1319) |
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Bishop Robert, O.S.B.
(1296.01.02 – 1307) | Bishop of Clonfert (Ireland) (1296.01.02 – 1307) |
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Bishop Johannes de Alatre (later Archbishop)
(1266 – 1295.10.02) | Consecrated Bishop: | 1266.12.19 |
| Bishop of Clonfert (Ireland) (1266 – 1295.10.02) Metropolitan Archbishop of Benevento (Italy) (1295.10.02 – 1300) |
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Bishop Tomás Ó Cellaigh (Tomás mac Domnaill Móir Ó Cellaig)
(1259 – 1263.01.06) | Bishop of Clonfert (Ireland) (1259 – 1263.01.06) |
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Bishop Cormac Ó Luimlín (Carus)
(1224? – 1259.06.19) | Bishop of Clonfert (Ireland) (1224? – 1259.06.19) |
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Bishop Máel Brigte Ua hEruráin
(1205 – ?) Bishop of Clonfert (Ireland) (1205 – ?) |
Bishop Muirchertach Ua Carmacáin
(? – 1203) | Bishop of Clonfert (Ireland) (? – 1203) |
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Bishop Domnall Ua Finn
(? – 1195) | Bishop of Clonfert (Ireland) (? – 1195) |
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Bishop Muirchertach Ua Máel Uidir
(1186 – 1187) |
Bishop Celechair Ua hAirmedaig
(1179? – 1186) | Bishop of Clonfert (Ireland) (1179? – 1186) |
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Bishop Máel Ísu Mac in Baird
(1172 – 1173) | Bishop of Clonfert (Ireland) (1172 – 1173) |
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Bishop Petrus Ua Mórda, O. Cist.
(1150 – 1171.12.27) | Bishop of Clonfert (Ireland) (1150 – 1171.12.27) |
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Bishop Gilla Pátraic Ua hAilchinned
(? – 1149) | Bishop of Clonfert (Ireland) (? – 1149) |
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Bishop Muiredach Ua hÉnlainge
(? – 1117) | Bishop of Clonfert (Ireland) (? – 1117) |
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| Abbots nullius of Clonfert (Roman Rite) |
Saint Bishop Brendan of Clonfert
(558 – 577.05.16) | Bishop-Abbot nullius of Clonfert (Ireland) (558 – 577.05.16) Bishop. |
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Cathedral of St Brendan, Loughrea, Galway, Connachta 
Cathedral of St Brendan, Clonfert, Galway, Connachta 
