In the earliest period of the diocese, the episcopal see was often referred to as Tír Conaill (the surrounding region). It was also sometimes written as Ráith Both, the Middle Irish spelling of the location. In 1266, Bishop Germanus of Derry forcibly transferred the Inishowen peninsula from the jurisdiction of the Diocese of Raphoe to the Diocese of Derry.
Also known as Patrick Ó Scannail, or Patricius. Elected circa November 1253 and consecrated on 30 November 1253. Translated to Armagh on 5 November 1261.
Also known as Cornelius. Formerly abbot of Assaroe Abbey and a canon of Raphoe Cathedral. Appointed on 23 December 1367. Resigned on 21 February 1397 and died in 1399.
Formerly a monk at Assaroe Abbey. Appointed on 21 February 1397.
1400
1419
Eóin Mac Carmaic
Also known as Johannes. Appointed before 8 December 1400. Died in office in 1419.
1420
1438
Lochlainn Ó Gallchobhair(I.)
Also known as Laurentius. Formerly Dean of Raphoe. Elected bishop before 27 February and appointed on 28 February 1420. Died in office in 1438.
1440
1442
Cornelius Mac Giolla Bhrighde
Formerly Dean of Raphoe. Appointed on 20 July 1440 and consecrated after 30 July 1440. Died in office before June 1442.
1443
1479
Lochlainn Ó Gallchobhair(II.)
Also known as Laurentius. Formerly a canon and official of Raphoe Cathedral. Appointed on 18 June 1442 and consecrated after 23 July 1443. Died in office before November 1479.
1479
1482
Johannes de Rogeriis
Possibly also known as Seaín Mac Ruaidhri. Formerly a priest of the Roman Church. Appointed on 12 November 1479. Died in office before November 1482.
1482
1514
Meanma Mac Carmaic
Also known as Menelaus Mac Carmacáin. Formerly Dean of Raphoe. Appointed on 4 November 1482. Resigned on 6 February 1514 and died on 9 May 1515.
Also known as Conn Ó Cathláin. Appointed by the papacy on 6 February 1514. Accepted royal supremacy in 1534. Died after 1550.
1534
1543
Éamonn Ó Gallchobhair
Also known as Edmund O'Gallagher. Appointed by the papacy on 11 May 1534, in opposition to O'Cahan, but was unable to take possession of the See. Died on 26 February 1543.
1547/54
1561
Art Ó Gallchobhair
Appointed by the papacy in 1547, in opposition to Ó Catháin, but did not take possession of the see until papal supremacy was re-established in Ireland by Queen Mary I in 1554. After the accession of Queen Elizabeth I in 1558, his position was uncertain. Died on 13 August 1561.
Nominated on 15 February and appointed by letters patent on 13 June 1605. Also was bishop of Derry (1605–1609), Clogher (1605–1621), and Meath (1609–1621). Died on 15 January 1621.
Nominated on 6 September 1671 and consecrated on 29 October 1671. Translated to Derry on 11 November 1681.
1682
1693
William Smyth
Translated from Killala and Achonry. Nominated on 16 January and appointed by letters patent on 17 February 1682. Translated to Kilmore and Ardagh on 5 April 1693.
Formerly Chancellor of St Patrick's Cathedral, Dublin. Nominated on 7 October 1714 and consecrated on 7 November 1714. Translated to Tuam on 8 June 1716.
1716
1743
Nicholas Forster
Translated from Killaloe. Nominated on 22 May 1716 and appointed by letters patent on 8 June 1716. Died in office on 5 June 1743.
Nominated on 28 February 1746 and consecrated on 29 March 1747. Died in office on 2 November 1752, allegedly shot while committing a robbery of a stagecoach near London. His only surviving child was from his second marriage and posthumous, Frances Twysden (1753–1821).
1753
1763
Robert Downes
Translated from Down and Connor. Nominated on 28 December 1752 and appointed by letters patent on 16 January 1753. Died in office on 30 June 1763.
Translated from Cork and Ross. Nominated on 23 July 1807 and appointed by letters patent on 10 August 1807. Translated to Clogher on 25 September 1819.
Known in English as John O'Cullenan. Appointed vicar apostolic by papal brief on 1 December 1621 and reappointed bishop by papal brief on 9 June 1625. Consecrated in 1629. Left Ireland in March 1653 and died in exile on 24 March 1661.
1657
unknown
(Hugh Ó Gallchobhair, vicar apostolic)
Appointed vicar apostolic by papal brief on 10 July 1657.
Appointed by papal brief on 21 July 1725 and consecrated on 25 November 1725. Translated to Kildare and Leighlin on 18 May 1737.
1737
1749
Bonaventure O'Gallagher, OFM
Also known as Daniel O'Gallagher. Appointed by papal brief on 10 December 1737 and consecrated on 29 December 1737. Died in office in 1749.
1750
1755
Anthony Ó Dónaill, OFM
Appointed by papal brief on 19 January 1750. Died in office on 20 or 26 April 1755.
1755
1758
Nathaniel Ó Dónaill
Appointed by papal brief on 18 July 1755. Died in office in 1758.
1759
1782
Philip Ó Raghallaigh
Appointed by papal brief on 9 January 1759 and consecrated on 22 April 1759. Died in office in 1782.
1782
1801
Anthony Coyle
Appointment as coadjutor bishop confirmed on 27 April 1777 and papal brief issued on 16 May 1777. Consecrated on 14 September 1777. Succeeded diocesan bishop in 1782. Died in office on 21 January 1801.
1796
1800
(James Dillon, coadjutor bishop)
Appointment as coadjutor bishop approved on 29 November 1795 and papal brief issued on 19 January 1796. Before succeeding, translated to Kilmore on 10 August 1800.
1801
1801
(John McElvoy, coadjutor bishop)
Appointment as coadjutor bishop approved on 18 January 1801 and papal brief issued on 30 January 1801. Did not succeed and died unconsecrated on 20 September 1801.
1802
1819
Peter MacLaughlin
Appointment confirmed on 25 April 1802 and papal brief issued on 14 May 1802. Consecrated on 24 August 1802. Additionally appointed Apostolic Administrator of Derry by papal brief on 12 January 1819. Resigned as Bishop of Raphoe on 29 July 1819. Subsequently became Bishop of Derry on 4 April 1824.
1820
1861
Patrick McGettigan
Appointment approved on 25 June 1802 and papal brief issued on 11 July 1820. Consecrated on 17 September 1820. Died in office on 1 May 1861.
Appointment as coadjutor bishop approved on 3 February 1856 and papal brief issued on 29 February 1856. Consecrated on 18 May 1856. Succeeded diocesan bishop on 1 May 1861. Translated to Armagh on 7 March 1870.
1871
1879
James McDevitt
Appointment approved on 12 February 1871 and papal brief issued on 24 February 1871. Consecrated on 30 April 1871. Died in office on 5 January 1879.
Appointed by papal brief on 13 May 1879 and consecrated on 20 July 1879. Translated to Armagh as coadjutor archbishop on 19 or 30 April 1887 and succeeded as Archbishop of Armagh on 3 December 1887.
Appointed by papal brief on 26 February 1888 and consecrated on 3 April 1888. Translated to Armagh as coadjutor archbishop on 14 February 1922 and succeeded as Archbishop of Armagh on 19 November 1924.
Cotton, Henry (1849). The Province of Ulster. Fasti Ecclesiae Hiberniae: The Succession of the Prelates and Members of the Cathedral Bodies of Ireland. Vol. 3. Dublin: Hodges and Smith.
Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I., eds. (1986). Handbook of British Chronology (3rd, reprinted 2003 ed.). Cambridge: Cambridge University Press. ISBN0-521-56350-X.
Moody, T. W.; Martin, F. X.; Byrne, F. J., eds. (1984). Maps, Genealogies, Lists: A Companion to Irish History, Part II. A New History of Ireland. Vol. IX. Oxford: Oxford University Press. ISBN0-19-821745-5.