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