William Mackay
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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