- Michael Shayne as The Cat in the Hat
- Joanne La Marr as Sarah Hall-Small
- Connie Earle as Cindy Lou Who
- Inspector Pierson as Sam-I-Am
- Lynne Evans as The White-Tufted Floozle Bird
- Max Allaron as Mack the Turtle
- Otto Kahn as Joey
- Julian Davis as Horton the Elephant
- Hal Brennon as Sylvester McMonkey McBean
- David Earle as Mr. Brown
- Rusty as The Lorax
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