John Harkness

John Harkness may refer to:

• John C. Harkness (1916–2016), American architect
• John Harkness (cricketer) (1867–1960), New Zealand cricketer
• Jack Harkness (footballer, born 1907) (John Diamond Harkness, 1907–1985), Scottish footballer
• John Granville Harkness (1831–1900), 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