 | Butch Patrick als Milo |
 | Mel Blanc als Officer Short Shrift / Dodecahedron / Demon of Insincerity (voice) |
 | Daws Butler als Whether Man / Senses Taker / Terrible Trivium / Gelatinous Giant (voice) |
 | Candy Candido als Awful DYNN (voice) |
 | Hans Conried als King Azaz / The MathemaGician (voice) |
 | June Foray als Ralph / Faintly Macabre / Princess of Pure Reason (voice) |
 | Patti Gilbert als Princess of Sweet Rhyme (voice) |
| Shepard Menken als Spelling Bee / Chroma (voice) |
 | Cliff Norton als akofonous A. Dischord / Tollbooth Speaker (voice) |
 | Larry Thor als Tock The Watchdog (voice) |
 | Les Tremayne als Humbug (voice) |
| Abe Levitow | Director |
| Norton Juster | Book |
| Chuck Jones | Screenplay |
| Sam Rosen | Screenplay |
| Chuck Jones | Director |
| Dave Monahan | Director |
| Les Goldman | Producer |
| Chuck Jones | Producer |
| Abe Levitow | Producer |
| Dean Elliott | Music |
| Lester Shorr | Director of Photography |
| William Faris | Editor |
| Maurice Noble | Production Design |
| George W. Davis | Art Direction |
| Charles K. Hagedon | Art Direction |
| Henry Grace | Set Decoration |
| Charles Pierce | Set Decoration |
| William Tuttle | Makeup Artist |
| Lee Pockriss | Music Arranger |
