Danny DeVito

Character: The Lorax (voice)

Ed Helms

Character: Once-ler (voice)

Zac Efron

Character: Ted Wiggins (voice)

Rob Riggle

Character: Mr. Aloysius O'Hare (voice)

Taylor Swift

Character: Audrey (voice)

Jenny Slate

Character: Mrs. Wiggins (voice)

Betty White

Character: Grammy Norma (voice)

Nasim Pedrad

Character: Once-ler's Mom (voice)

Joel Swetow

Character: 1st Marketing Guy (voice)

Michael Beattie

Character: 2nd Marketing Guy (voice)

Elmarie Wendel

Character: Aunt Grizelda (voice)

Dave B. Mitchell

Character: 1st Commercial Guy (voice)

Dempsey Pappion

Character: 2nd Commercial Guy (voice)

Danny Cooksey

Character: Brett / Chet (voice)

Stephen Tobolowsky

Character: Uncle Ubb (voice)

Chris Renaud

Character: Forest Animals (voice)

Sherry Lynn

Character: Additional Voices (voice)

Mickie McGowan

Character: Additional Voices (voice)

Jack Angel

Character: Additional Voices (voice)

Bob Bergen

Character: Additional Voices (voice)

Debi Derryberry

Character: Additional Voices (voice)

Danny Mann

Character: Additional Voices (voice)

Fletcher Sheridan

Character: Cy (voice)

John Cygan

Character: Additional Voices (voice)

Bill Farmer

Character: Additional Voices (voice)

Jess Harnell

Character: Additional Voices (voice)

Mona Marshall

Character: Additional Voices (voice)

Laraine Newman

Character: Additional Voices (voice)

Jan Rabson

Character: Additional Voices (voice)

Claira Nicole Titman

Character: Additional Voices (voice)

Jim Ward

Character: Additional Voices (voice)

Kev Adams

Character: (voice) (uncredited)

François Berléand

Character: (voice) (uncredited)

Alexandra Lamy

Character: (voice) (uncredited)