• 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 ==See also==