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