James Corden
Peter Rabbit (voice)
Rose Byrne
Beatrix 'Bea' Potter / Jemima Puddle-Duck (voice)
Domhnall Gleeson
Thomas McGregor / Mr. Jeremy Fisher (voice)
Margot Robbie
Flopsy Rabbit / Narrator (voice)
Elizabeth Debicki
Mopsy Rabbit (voice)
Daisy Ridley
Cottontail Rabbit (voice)
Colin Moody
Benjamin Bunny (voice)
Sam Neill
Mr. McGregor / Tommy Brock (voice)
Marianne Jean-Baptiste
Harrods General Manager
Felix Williamson
Derek
Sia
Mrs. Tiggy-Winkle (voice)
Fayssal Bazzi
Mr. Tod (voice)
Ewen Leslie
Pigling Bland (voice)
Christian Gazal
Felix D'eer (voice)
Rachel Ward
Josephine Rabbit (voice)
Bryan Brown
Mr. Rabbit (voice)
