John MacKay, Mackay, or McKay may refer to:
Arts and entertainment John Mackay (poet) (1656–1754), Scottish Gaelic poet known as Am Pìobaire Dall John Henry Mackay (1864–1933), Scottish writer, anarchist, thinker and homosexual activist John Victor Mackay (1891–1945), American art director John D. Mackay (1909–1970), Orcadian schoolteacher John P. McKay (died 2022), American historian and professor, author of A History of Western Society John McKay (pianist) (born 1938), Canadian-American pianist John McKay (guitarist) (born 1958), British guitarist and former member of Siouxsie & the Banshees John McKay (director) (born 1965), British film and television director
Business John Mackay (industrialist, born 1774) (1774–1841), ship master and industrialist in Boston, Massachusetts John William Mackay (1831–1902), Irish-born American industrialist John Calder Mackay (1920–2014), American real estate developer
Military and public service John Frederick MacKay (1873–1930), Scottish recipient of the Victoria Cross Sir John McKay (police officer) (1912–2004), British police officer John B. McKay (1922–1975), U.S. Navy officer and test pilot John McKay (attorney) (born 1956), United States Attorney for the Western District of the state of Washington
Politics John McKay (Ontario politician, born 1841) (1841–1918), Ontario physician and political figure John McKay (English politician) (1883–1964), British Labour Party MP for Wallsend, 1945–1964 John Keiller MacKay (1888–1970), 19th Lieutenant Governor of Ontario, Canada, 1957–1963 John George MacKay (1893–1974), farmer and political figure on Prince Edward Island William John MacKay (fl. 1929–1934), Ontario politician John P. MacKay (fl. 1937–1943), Ontario politician John MacKay, Baron MacKay of Ardbrecknish (1938–2001), Scottish Conservative Member of Parliament for Argyll, 1979–1987 John McKay (Northern Ireland politician) (born 1945), member of the Northern Ireland Constitutional Convention John McKay (New Brunswick politician) (born 1948), former Speaker of the Legislative Assembly of New Brunswick and mayor of Miramichi, New Brunswick John McKay (Ontario politician, born 1948) (born 1948), member of the Canadian parliament John M. McKay (born 1948), American politician from Florida
Science John Bain Mackay (1795–1888), nurseryman based in Clapton, London John Sturgeon Mackay (1843–1914), Scottish mathematician John Yule Mackay (1860–1930), Scottish anatomist and principal of University College, Dundee John Ross Mackay (1915–2014), Canadian geographer John McKay (mathematician) (1939–2022), British-Canadian mathematician
Sports John Sutherland Mackay (1848–1924), Scottish medical doctor and president of Rio Tinto FC John McKay (1850–1916), co-founder of the Gaelic Athletic Association John McKay (footballer, born 1898) (1898–?), Scottish footballer John McKay (American football) (1923–2001), American football coach John McKay (1950s footballer), Scottish footballer John Mackay (cricketer) (born 1937), Australian cricketer J. K. McKay (John Kenneth McKay, born 1953), American football wide receiver John Mackay (rugby league) (born 1956), Australian rugby league player
Others John Mackay, 11th of Strathnaver (died 1529), Scottish chief of Clan Mackay John Mackay (Australian pioneer) (1839–1914), founder of the city of Mackay, Australia John A. Mackay (1889–1983), Scottish missionary and founder of the Anglo-Peruvian School in Lima, Peru John Calvin MacKay (1891–1986), Free Church of Scotland minister John MacKay (journalist) (born 1966), Scottish television journalist and newscaster
See also Jack McKay (disambiguation) John Mackey (disambiguation) John Mackie (disambiguation)