John Harkness

• John C. Harkness, American architect
• John Harkness (cricketer), New Zealand cricketer
• Jack Harkness (footballer, [born 1907)], Scottish footballer
• John Granville Harkness, British Major-General during the Victorian era
• Steve Englehart, comic book writer who used pseudonym John Harkness
• John Harkness, a character in ''You're [in the Navy Now]''