John, Johnny, or Jock Mackenzie or MacKenzie may refer to:
Academics John Mackenzie (1806–1848), Scottish literary scholar John Stuart Mackenzie (1860–1935), British philosopher John M. MacKenzie (born 1943), British historian
Law and politics John Muir Mackenzie (1854–1916), British governor of Bombay John Ashton MacKenzie (1917–2010), U.S. federal judge John Archie MacKenzie (1934–2017), Canadian politician in Nova Scotia
Military John Mackenzie, Lord MacLeod (1727–1789), Scottish army officer John Randoll Mackenzie (1763–1809), Scottish army general John Mackenzie (VC) (1869–1915), Scottish military officer John MacKenzie (Medal of Honor) (1886–1933), American naval sailor John Noble MacKenzie (1914–1993), New Zealand military flying ace
Religion John Mackenzie (missionary) (1835–1899), Scottish missionary in Southern Africa John W. Mackenzie (c. 1845–1914), Canadian missionary to Vanuatu John Kenneth MacKenzie (1850–1886), English medical missionary to China
Science and medicine John MacKenzie (doctor) (died 1837), Scottish surgeon John Joseph Mackenzie (1865–1922), Canadian pathologist John Edwin MacKenzie (1868–1955), Scottish chemist John Gretton Mackenzie (1881–1953), New Zealand botanist
Sports John Mackenzie (sailor) (1876–1949), British sailor Jock Mackenzie (1882–?), Scottish footballer Jock MacKenzie (1885–1940), Scottish footballer Johnny MacKenzie (1925–2017), Scottish footballer
Others John Mackenzie, 9th of Kintail (died 1561), Scottish chief of Clan Mackenzie John Mackenzie (banker) (1787–1854), Scottish banker John Mackenzie (colonial settler) (1793–1857), Australian pioneer John MacKenzie (mountain guide) (1856–1933), British mountain guide John Drew MacKenzie (1861–1918), British artistic craftsman John Mackenzie (film director) (1928–2011), Scottish film director John Mackenzie, 5th Earl of Cromartie (born 1948), Scottish chief of Clan Mackenzie
See also John McKenzie (disambiguation) Jack McKenzie (disambiguation)