James Corden Peter Rabbit (voice) Rose Byrne Bea Domhnall Gleeson Mr. Thomas McGregor David Oyelowo Nigel Basil-Jones Margot Robbie Flopsy Rabbit / The Narrator (voice) Elizabeth Debicki Mopsy Rabbit (voice) Aimee Horne Cottontail Rabbit (voice) Colin Moody Benjamin Bunny (voice) Lennie James Barnabas (voice) Damon Herriman Tom Kitten (voice) Hayley Atwell Mittens (voice) Sia Mrs. Tiggy-Winkle (voice) Sam Neill Tommy Brock (voice) Ewen Leslie Pigling Bland (voice) David Wenham Johnny Town-Mouse (voice) Tim Minchin Busker K. Bushy, Esq (voice) Tara Morice Officiant Dave Lawson Chris Alex Blias Phil Jude Hyland Toy Shop Young Boy