| Tenure | Incumbent | Notes |
| Vicariate Apostolic of the Highland District |
| 16 September 1727 to 19 September 1727 | Bishop Alexander John Grant, Vicar Apostolic of the Highland District | Died in office |
| 12 February 1731 to 12 March 1773 | Bishop Hugh MacDonald, Vicar Apostolic of the Highland District | Priest; died in office |
| 12 March 1773 to 9 May 1779 | Bishop John MacDonald, Vicar Apostolic of the Highland District | Coadjutor Vicar Apostolic of Highland District; died in office |
| 30 September 1779 to 9 September 1791 | Bishop Alexander MacDonald, Vicar Apostolic of the Highland District | Priest; died in office |
| 8 November 1791 to 8 July 1814 | Bishop John Chisholm, Vicar Apostolic of the Highland District | Priest; died in office |
| 8 July 1814 to 31 July 1818 | Bishop Aenaes Chisholm, Vicar Apostolic of the Highland District | Coadjutor Vicar Apostolic of Highland District; died in office |
| 27 August 1819 to 13 February 1827 | Bishop Ranald MacDonald, Vicar Apostolic of the Highland District | Appointed Vicar Apostolic of Western District |
| Vicariate Apostolic of the Northern District |
| 13 February 1827 to 23 February 1869 | Bishop James Kyle, Vicar Apostolic of the Northern District | Priest; died in office |
| 23 February 1869 to 15 March 1878 | Bishop John MacDonald, Vicar Apostolic of the Northern District | Coadjutor Vicar Apostolic of the Northern District; Becoming Bishop of Aberdeen |
| Diocese of Aberdeen |
| 15 March 1878 to 4 February 1889 | John MacDonald | Hitherto Vicar Apostolic of the Northern District; died in office |
| 16 July 1889 to 26 September 1889 | Colin Grant | Priest; ordained 13 August 1889; died in office |
| 14 August 1890 to 29 May 1898 | Hugh McDonald, CSSR | Priest of the Congregation of the Most Holy Redeemer; ordained 23 October 1890; died in office |
| 7 January 1899 to 13 January 1918 | Aeneas Chisholm | Priest; ordained 24 February 1899; died in office |
| 18 June 1918 to 25 December 1946 | George Henry Bennett | Priest; ordained 1 August 1918; died in office |
| 2 August 1947 to 5 July 1950 | John Alexander Matheson | Priest; ordained 24 September 1947; died in office |
| 20 June 1951 to 22 July 1963 | Francis Raymond Walsh, M.Afr. | Priest of the Missionaries of Africa (White Fathers) ; ordained 12 September 1951; resigned |
| 8 December 1964 to 28 May 1976 | Michael Foylan | Priest; ordained 25 March 1965; died in office |
| 28 February 1977 to 15 January 2002 | Mario Joseph Conti | Priest of Aberdeen; ordained 3 May 1977; appointed Archbishop of Glasgow |
| 13 October 2003 to present | Peter Antony Moran | Priest of Aberdeen; ordained 1 December 2003 |