Alexander McDonnell (1798–1835), sometimes spelled MacDonnell, was an Irish chess master, who played a series of six matches with the world's leading chess player, Louis-Charles Mahé de La Bourdonnais, in 1834.
- Occupation
- chess player
- Citizenship
- United Kingdom of Great Britain and Ireland
- Born
- May 22, 1798
- Died
- September 14, 1835