- Bill Chandler as The Cat in the Hat
- Connie Allenbury as Sarah Hall-Small
- Gladys Benton as Cindy Lou Who
- Warren Haggerty as Sam-I-Am
- J.B. Allenbury as Mack the Turtle
- Spike Dolan as Horton the Elephant
- Curtis Farwood as The Lorax
- Hector Boswell as Mr. Brown
- Joe as Joey
- Mary as The White-Tufted Floozle Bird
- Barbara Norvell as Pam-I-Am
- Homer Henshaw as King Derwin
- Mrs. Burns Norvell as Daisy-Head Mayzie
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