Danny DeVito

The Lorax (voice)

Ed Helms

Once-ler (voice)

Zac Efron

Ted Wiggins (voice)

Rob Riggle

Mr. Aloysius O'Hare (voice)

Taylor Swift

Audrey (voice)

Jenny Slate

Mrs. Wiggins (voice)

Betty White

Grammy Norma (voice)

Nasim Pedrad

Once-ler's Mom (voice)

Joel Swetow

1st Marketing Guy (voice)

Michael Beattie

2nd Marketing Guy (voice)

Elmarie Wendel

Aunt Grizelda (voice)

Dave B. Mitchell

1st Commercial Guy (voice)

Dempsey Pappion

2nd Commercial Guy (voice)

Danny Cooksey

Brett / Chet (voice)

Stephen Tobolowsky

Uncle Ubb (voice)

Chris Renaud

Forest Animals (voice)

Sherry Lynn

Additional Voices (voice)

Mickie McGowan

Additional Voices (voice)

Jack Angel

Additional Voices (voice)

Bob Bergen

Additional Voices (voice)

Debi Derryberry

Additional Voices (voice)

Danny Mann

Additional Voices (voice)

Fletcher Sheridan

Cy (voice)

John Cygan

Additional Voices (voice)

Bill Farmer

Additional Voices (voice)

Jess Harnell

Additional Voices (voice)

Mona Marshall

Additional Voices (voice)

Laraine Newman

Additional Voices (voice)

Jan Rabson

Additional Voices (voice)

Claira Nicole Titman

Additional Voices (voice)

Jim Ward

Additional Voices (voice)