Alexander MacDonnell may refer to:
Sir Alexander Macdonnell (died 1634), of the Macdonnell baronets of Maye Sir Alexander Macdonnell, 1st Baronet (1794–1875), of the Macdonnell baronets of Kilsharvan Alexander MacDonnell, 3rd Earl of Antrim (1615–1699) Alastair Ruadh MacDonnell (c. 1725–1761), also called Alexander Alexander Macdonell (bishop of Kingston) (1762–1840), first Roman Catholic bishop of Kingston, Upper Canada
See also Alexander McDonnell (disambiguation) Alexander Macdonell (disambiguation)