Alexander MacDonnell
Alexander MacDonnell may refer to:
- Sir Alexander Macdonnell, of the Macdonnell baronets of Maye
- Sir Alexander Macdonnell, 1st Baronet, of the Macdonnell baronets of Kilsharvan
- Alexander MacDonnell, 3rd Earl of Antrim
- Alastair Ruadh MacDonnell, also called Alexander
- Alexander Macdonell (bishop of Kingston), first Roman Catholic bishop of Kingston, Upper Canada