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 Alex Blias Phil Dave Lawson Chris Sam Haft Postman Jessica Friedman Singing Sparrow (voice) Chris Mann Singing Sparrow (voice) Fletcher Sheridan Singing Sparrow (voice) Grant Crookes Passerby (uncredited) Gareth Davies Bannerman