Alexander Macdonell

Alexander Macdonell may refer to:
 * Alexander Macdonell of Greenfield (1782–1835), politician in Upper Canada
 * Alexander Macdonell (bishop of Kingston) (1762–1840), first Bishop of Kingston, Ontario
 * Alexander Macdonell (bishop of Alexandria-Cornwall), bishop of the Roman Catholic Diocese of Alexandria-Cornwall, 1890–1905
 * Alexander Macdonell (politician) (1762–1842), elected representative for Glengarry County, Ontario and soldier in the War of 1812
 * Alexander Ranaldson MacDonell (1773–1828), Scottish clansman
 * Alexander McDonell (politician) (1786–1861), politician for Northumberland County, Ontario