John McKenzie may refer to:
- John McKenzie (New Zealand politician) (1839–1901), New Zealand politician
- John McKenzie (ice hockey) (born 1937), Canadian ice hockey player
- John C. McKenzie (1860–1941), United States Representative from Illinois
- John McKenzie (painter), Scottish painter
- John McKenzie (cricketer), New Zealand cricketer
- John D. McKenzie (1889–1952), American-born businessman and political figure in Nova Scotia
- John Patrick McKenzie (born 1962), San Francisco-based artist