Alexander Macdonell and over five hundred Roman Catholic highlanders leave Scotland to settle in Glengarry County, Ontario.

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