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)