William Mackay or MacKay may refer to: *

William Mackay (artist) William Andrew Mackay (1876 - July 26, 1939) was an American artist who created a series of murals about the achievements of Theodore Roosevelt. Those three murals, completed in 1936, were installed beneath the rotunda in the Roosevelt Memorial Ha ...

(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

See also