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