| Vicar Apostolic of the Highland District | |
| Church: | Roman Catholic Church |
| Term: | 1779–1791 |
| Predecessor: | John MacDonald |
| Successor: | John Chisholm |
| Other Post: | Titular Bishop of Polemonium |
| Ordination: | 10 August 1764 |
| Ordained By: | Domenico Giordani |
| Consecration: | 12 March 1780 |
| Consecrated By: | George Hay |
| Birth Place: | Bornish, South Uist, Scotland |
| Death Date: | 9 September 1791 (aged about 55) |
| Death Place: | Samalaman, Scotland |
| Alma Mater: | Pontifical Scots College |
Alexander MacDonald (– 9 September 1791) was a Roman Catholic bishop who served as the Vicar Apostolic of the Highland District, Scotland.
Born in Bornish, South Uist in about 1736, he was ordained a priest on 10 August 1764. He was appointed the Vicar Apostolic of the Highland District and Titular Bishop of Polemonium by the Holy See on 30 September 1779. He was consecrated to the Episcopate on 12 March 1780. The principal consecrator was Bishop George Hay, and the principal co-consecrator was Bishop Alexander Cameron. In 1783, he moved the seminary for the Highland District to Samalaman House. He died in office on 9 September 1791, aged 55.[1]
. William Maziere Brady. The Episcopal Succession in England, Scotland and Ireland, A.D. 1400 to 1875 . 1876 . Tipografia Della Pace . Rome . 3 . 466–467.