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)

Rachel Ward

Josephine Rabbit (voice)

Bryan Brown

Mr. Rabbit (voice)

David Wenham

Johnny Town-Mouse (voice)

Ming-Zhu Hii

Sarabeth

Lance Kerfuffle

J. David Scarfington

Natalie Dew

Janelle

Vauxhall Jermaine

Harrods Security

Sacha Horler

Betty

Sam Haft

Postman

Jessica Friedman

Singing Sparrow (voice)

Chris Mann

Singing Sparrow (voice)

Fletcher Sheridan

Singing Sparrow (voice)

Alexandra Gluck

London Street Rat (voice)

Taryn Gluck

London Street Rat (voice)

Grant Crookes

Passerby (uncredited)