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)

Dempsey Pappion

2nd Commercial Guy (voice)