Zac Efron Ted Wiggins (voice)
Danny DeVito The Lorax (voice)
Taylor Swift Audrey (voice)
Jenny Slate Mrs. Wiggins (voice)
Ed Helms Once-ler (voice)
Bob Bergen Additional Voices (voice)
Stephen Tobolowsky Uncle Ubb (voice)
Dr. Seuss Book
Rob Riggle Mr. Aloysius O'Hare (voice)
Dave B. Mitchell 1st Commercial Guy (voice)
Kyle Balda Co-Director
Laraine Newman Additional Voices (voice)
Mike Reiss Story Consultant
Bill Farmer Additional Voices (voice)
Debi Derryberry Additional Voices (voice)
Daniel Chong Additional Storyboarding
Betty White Grammy Norma (voice)
Danny Cooksey Brett / Chet (voice)
Nasim Pedrad Once-ler's Mom (voice)
Ken Daurio Executive Producer, Screenplay
Jack Angel Additional Voices (voice)
Chris Renaud Director, Forest Animals (voice)
Cinco Paul Executive Producer, Songs, Screenplay
Joel Swetow 1st Marketing Guy (voice)
Mona Marshall Additional Voices (voice)
Jess Harnell Additional Voices (voice)
John Powell Original Music Composer, Songs
Mickie McGowan Additional Voices (voice)
Julien Soret Supervising Animator
Dempsey Pappion 2nd Commercial Guy (voice)
Danny Mann Additional Voices (voice)
Jim Ward Additional Voices (voice)
Randy Thom Sound Re-Recording Mixer, Supervising Sound Editor, Sound Designer
Jan Rabson Additional Voices (voice)
John Cygan Additional Voices (voice)
Glenn McCoy Additional Storyboarding
Chris Meledandri Producer
Mark O'Hare Story Artist
Daniel Laurie ADR Supervisor, Dialogue Editor
Gary Rizzo Sound Re-Recording Mixer
Eric Favela Additional Storyboarding
Sherry Lynn Additional Voices (voice)
Dennis Leonard Supervising Sound Editor
Jana Vance Foley Artist
Janet Healy Producer
Robert Taylor Associate Producer
Bruno Chauffard CG Supervisor
Guy Bar'ely Story Artist
Frank Rinella Foley Mixer
Fletcher Sheridan Cy (voice)
Eric Guillon Character Designer, Art Direction
Luke Dunn Gielmuda Foley Editor
Fabrice Joubert Animation, Supervising Animator
John Holmquist Additional Storyboarding
Sean England Foley Artist
Boris Jacq Production Manager
Elmarie Wendel Aunt Grizelda (voice)
Claire Dodgson Editor
Carter Goodrich Character Designer
Audrey Geisel Executive Producer
Michael Beattie 2nd Marketing Guy (voice)
Nicolas Bauduin Supervising Animator
Dennie Thorpe Foley Artist
Didier Ah-Koon Story Artist
Sue Fox Foley Editor
Wilbert Plijnaar Story Artist
Yarrow Cheney Production Design, Character Designer
Jérémie Moreau Character Designer
Ken Schretzmann Editor
Steve Moore Story Artist
Mike Kim Story Artist
Matt Flynn Story Artist