John Harmon (30 Junie 1905 – 6 Augustus 1985) was 'n Amerikaanse akteur. Hy was bekend vir sy rolle in die rolprente A Slight Case of Murder (1938), King of the Underworld (1939), en The Monster of Piedras Blancas (1959), en in die televisiereeks Star Trek (1966).
- 1938: A Slight Case of Murder
- 1939: King of the Underworld
- 1942: I Was Framed
- 1949: Alias the Champ
- 1953: Run for the Hills
- 1959: The Monster of Piedras Blancas
- 1961: The 7th Commandment
- 1966: The Street Is My Beat
- 1977: Hitch Hike to Hell
- 1947: Public Prosecutor
- 1954: Public Defender
- 1959: Johnny Ringo
- 1961: Whispering Smith
- 1966: Star Trek
- 1968: Lassie: The Adventures of Neeka
