William Mackay or MacKay may refer to:
- William Mackay (artist) (1876–1939), American artist
- William Andrew MacKay (1929–2013), Canadian lawyer, judge and university president
- William Paton Mackay (1839–1885), Scottish doctor, Presbyterian minister and hymn writer
- William MacKay (politician) (1847–1915), physician and political figure in Nova Scotia
- William Alexander Mackay (1860–1927), Scottish doctor who co-founded Spain's oldest football club, Recreativo de Huelva
- William John MacKay, Ontario politician
See also
editThis disambiguation page lists articles about people with the same name.
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