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Eddie Albert as Narrator |
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Bob Holt as The Lorax / The Once-ler (voice) |
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Athena Lorde as Miss O'Schmunsler (voice) |
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Harlen Carraher as Boy (voice) |
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Scatman Crothers as Singer |
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Vivian Vance as Singer |
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Thurl Ravenscroft as Singer |
| Directing | Hawley Pratt | Director |
| Production | Dr. Seuss | Producer |
| Production | Friz Freleng | Producer |
| Sound | Dean Elliott | Music |
| Art | Irv Spector | Storyboard Artist |
| Writing | Dr. Seuss | Writer |
| Writing | Dr. Seuss | Book |
| Art | Maurice Noble | Production Design |
| Production | David H. DePatie | Executive Producer |
| Visual Effects | Warren Batchelder | Animation |
| Visual Effects | John Gibbs | Animation |
| Visual Effects | Manny Gould | Animation |
| Visual Effects | Bob Matz | Animation |
| Visual Effects | Bob Richardson | Animation |
| Visual Effects | Robert Taylor | Animation |
| Visual Effects | Richard Thompson | Animation |
| Visual Effects | Don Williams | Animation |
| Art | Richard H. Thomas | Background Designer |
| Editing | Lee Gunther | Editor |
| Editing | Joe Siracusa | Editor |
| Editing | Rick Steward | Editor |
| Production | Stan Paperny | Executive In Charge Of Production |
| Production | Harry Love | Production Supervisor |
