John McKenzie may refer to:

• John McKenzie (painter) (1831–1909), Scottish painter
• John Patrick McKenzie (born 1962), American artist is San Francisco
• John McKenzie (director), director of 1996 British comedy film Vol-au-vent
• John McKenzie (musician), British bass player active since 1970

• John McKenzie (New Zealand politician) (1839–1901), New Zealand politician
• John C. McKenzie (1860–1941), American representative from Illinois
• John D. McKenzie (1889–1952), American-born businessman and political figure in Nova Scotia

• John McKenzie (Australian footballer) (1885–1971), played for Geelong in 1906
• John McKenzie (Australian cricketer) (1862–1944), Australian cricketer
• John McKenzie (New Zealand cricketer) (fl. 1893–95), New Zealand cricketer
• John McKenzie (ice hockey) (1937–2018), Canadian ice hockey player
• John McKenzie (American football), American football player and coach
• Johnny McKenzie (footballer) (fl. 1930s), Scottish footballer (Third Lanark, Aberdeen)
• John McKenzie (wrestler)

• John W.P. McKenzie (died 1853), American missionary to the Choctaws and founder of McKenzie College in Texas
• John McKenzie (philanthropist) (1876–1955), New Zealand businessman
• John McKenzie (trade unionist) (1885–1958), Scottish trade unionist
• John L. McKenzie (1910–1991), American Catholic theologian
• John Grant McKenzie, Scottish Congregational minister, psychologist and academic
• John Kinsey (c. 1842 – 1904), also known as John McKenzie, American soldier

• John Mackenzie (disambiguation)
• Jack McKenzie (disambiguation)