- Chuck Jones Productions
- Feature Length Theatrical Animated Film
- Cartoon Characters: Milo, Demon of Insincerity, Letter Vendor, Officer Shortshrift, The Dodechahedron, The Gelatinous Giant, The Senses Taker, The Terrible Trivium, The Whether Man, Awful DYNN, Poet, The Humbug, King Azaz the Unabridged, The Mathemagician, Faintly Macabre (The Which), Princess of Pure Reason, Princess of Sweet Reason, Chroma the Great, The Spelling Bee, Dr. Kakofanus A. Dischord, Tollbooth Speaker, Tock, Ministers, Lethargians.
- Vocal Talent: Butch Patrick (Milo), Mel Blanc (Demon of Insincerity, Letter Vendor, Officer Shortshrift, The Dodechahedron, Ministers, Lethargian), Daws Butler (The Gelatinous Giant, The Senses Taker, The Terrible Trivium, The Whether Man), Candy Candido (Awful DYNN), Les Tremayne (Poet, The Humbug), Hans Conried (King Azaz the Unabridged, The Mathemagician), June Foray (Faintly Macabre [The Which], Princess of Pure Reason), Patti Gilbert (Princess of Sweet Reason), Shepard Menken (Chroma the Great, The Spelling Bee), Cliff Norton (Dr. Kakofanus A. Dischord, Tollbooth Speaker Voice), Larry Thor (Tock), Thurl Ravenscroft (Lethargian).
- Directed By Chuck Jones, Abe Levitow.
Live-Action Director: Dave Monahan.
- Produced By Chuck Jones, Abe Levitow, Les Goldman.
- Animated By Ed Aardal, Carl Bell, Ed De Mattia, Bill Littlejohn, Tom Ray, Phil Roman, Irven Spence, Richard Thompson, Lloyd Vaughan, Xenia, Alan Zaslove.
Animation Supervisors: Hal Ambro, George Nicholas, Ben Washam.
- Written By Chuck Jones (as Charles M. Jones), Sam Rosen.
Based on the Book By: Norton Juster.
- Edited By William Faris.
- Music By Dean Elliott.
Songs: Lee Pockriss (uncredited).
Lyricist: Paul Vance (uncredited).