The Lorax (voice)
Danny DeVito
Once-ler (voice)
Ed Helms
Aunt Grizelda (voice)
Elmarie Wendel
1st Commercial Guy (voice)
Dave B. Mitchell
2nd Commercial Guy (voice)
Dempsey Pappion
Brett / Chet (voice)
Danny Cooksey
Uncle Ubb (voice)
Stephen Tobolowsky
Forest Animals (voice)
Chris Renaud
Additional Voices (voice)
Sherry Lynn
Mickie McGowan
Jack Angel
Bob Bergen
Ted Wiggins (voice)
Zac Efron
Debi Derryberry
Danny Mann
Cy (voice)
Fletcher Sheridan
John Cygan
Bill Farmer
Jess Harnell
Mona Marshall
Laraine Newman
Jan Rabson
Claira Nicole Titman
Mr. Aloysius O'Hare (voice)
Rob Riggle
Jim Ward
Audrey (voice)
Taylor Swift
Mrs. Wiggins (voice)
Jenny Slate
Grammy Norma (voice)
Betty White
Once-ler's Mom (voice)
Nasim Pedrad
1st Marketing Guy (voice)
Joel Swetow
2nd Marketing Guy (voice)
Michael Beattie
Executive Producer
Ken Daurio
Screenplay
Character Designer
Carter Goodrich
Co-Director
Kyle Balda
Original Music Composer
John Powell
Songs
Director
Cinco Paul
Sound Re-Recording Mixer
Randy Thom
Supervising Sound Editor
Sound Designer
Editor
Ken Schretzmann
Gary Rizzo
Producer
Chris Meledandri
Audrey Geisel
Eric Guillon
ADR Supervisor
Daniel Laurie
Dialogue Editor
Dennis Leonard
Book
Dr. Seuss
Production Design
Yarrow Cheney
Janet Healey
Animation
Mitja Rabar
Claire Dodgson
Steven Liu
Music Supervisor
Massimo Ruberto
Fabrice Joubert
Lighting Artist
Catherine Catie Lee