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| Año | Título | Personaje | Valoración |
|---|---|---|---|
| 1975 | Pastries | Doctor (archive footage) (uncredited) | ☆☆☆☆☆ |
| 1974 | The Young Secretaries | Robert Cameron | ★★☆☆☆ |
| 1974 | Angel Above - and the Devil Below | Peter Harp | ★★★☆☆ |
| 1974 | Angie Baby | Mr. Gallo (as Barney Bossick) | ☆☆☆☆☆ |
| 1973 | Frankie and Johnnie... Were Lovers | Ray | ★★★☆☆ |
| 1973 | Heads or Tails | Mr. Bennett | ☆☆☆☆☆ |
| 1973 | My Deep Hunger | Police Lt. James Mallory | ★★☆☆☆ |
| 1972 | The Adult Version of Jekyll & Hide | Dr. Chris Leeder | ★★☆☆☆ |
| 1972 | Wrong Way | Jack | ★☆☆☆☆ |
| 1972 | The Cremators | Merv (as Barney Bossick) | ★☆☆☆☆ |
| 1972 | Hell's Kitten | Chessy's Client | ☆☆☆☆☆ |
| 1972 | Sex in the Comics | Thug With Spike / Others (uncredited) | ★★★★☆ |
| 1972 | Prison Girls | Jack | ★★☆☆☆ |
| 1971 | A Touch of Sweden | Dr. Bob Dart (as Barney Bosnick) | ★★☆☆☆ |
| 1971 | Documentary of a Madam | ☆☆☆☆☆ | |
| 1970 | The Golden Box | Reynaldo aka Numero Uno | ★★☆☆☆ |
Películas destacadas de John Barnum
Estas son las películas más destacadas en las que ha trabajdo:
