 | Ringo Starr als Narrator / Father (home video release) (voice) |
 | Paul Frees als Oblio's Father / Pointed Man's Right Head / King / Leaf Man / Villagers (voice) |
 | Lennie Weinrib als Count (voice) |
 | Bill Martin als Rock Man (voice) |
| Buddy Foster als Count's Son (voice) |
 | Joan Gerber als Oblio's Mother (voice) |
 | Mike Lookinland als Oblio (voice) |
| Alan Barzman als Narrator / Father (second telecast) |
 | Dustin Hoffman als Narrator / Father (first telecast) |
 | Alan Thicke als Narrator / Father (third telecast) |
| Fred Wolf | Director |
| Sherm Thompson | Production Manager |
| Harry Nilsson | Producer |
| Harry Nilsson | Original Music Composer |
| Fred Wolf | Producer |
| Jerry D. Good | Producer |
| Gary Lund | Production Design |
| Larry Gordon | Producer |
| Carole Beers | Story |
| Norm Lenzer | Screenplay |
| Rich Harrison | Editor |
| Jimmy T. Murakami | Producer |
| Harry Nilsson | Story |
| Tony Rivetti Sr. | Camera Operator |
| Charles Swenson | Animation |
| George Aliceson Tipton | Music Arranger |
| Vincent Davis | Animation |
| James L. Aicholtz | Sound Re-Recording Mixer |
| Fred Wolf | Animation |
| George Aliceson Tipton | Conductor |
| Harry Nilsson | Songs |
