A
- Alasdair McDonnell (born 1949), Northern Irish politician and MP from Cushendall
- Alestair Ruadh MacDonnell (1725–1761), Scottish chief of Glengarry, secret agent and spy on Prince Charles Edward after 1750
- Alexander McDonnell, 9th Earl of Antrim (born 1935), British peer from Northern Ireland
- Alexander McDonnell (1798–1835), Irish chess master
- Alexander McDonnell (engineer) (1829–1904), locomotive designer and Chief Mechanical Engineer
- Sir Alexander McDonnell, 1st Baronet (1794–1875), Anglo-Irish civil servant, commissioner of national education in Ireland
- Lady Alice McDonnell (born 1964), Anglo-Irish noblewoman
- Angus McDonnell (1881–1966), English politician and MP from Dartford
- Antony MacDonnell, 1st Baron MacDonnell (1844–1925), Irish-born British politician, involved in the administration of India
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