Ben Whishaw
Paddington Brown (voice)
Hugh Bonneville
Henry Brown
Hugh Grant
Phoenix Buchanan
Madeleine Harris
Judy Brown
Samuel Joslin
Jonathan Brown
Imelda Staunton
Aunt Lucy (voice)
Brendan Gleeson
Knuckles McGinty
Jim Broadbent
Samuel Gruber
Peter Capaldi
Reginald Curry
Ben Miller
Colonel Lancaster
Michael Gambon
Uncle Pastuzo (voice)
Tom Conti
Judge Gerald Biggleswade
Joanna Lumley
Felicity Fanshaw
Kobna Holdbrook-Smith
Warden Walker
Richard Ayoade
Forensic Investigator
Nicholas Woodeson
Insurance Company CEO
Eileen Atkins
Madame Kozlova
Marie-France Alvarez
Mademoiselle Dubois
Shola Adewusi
First Ms. Peters
Nadine Marshall
Second Ms. Peters
Michael Mears
Clerk of Court
Enzo Squillino Jr.
Mr. Giuseppe
Catherine Shepherd
Nelson's Mother
Claire Keelan
Police Officer
Geoffrey Lumb
Second Police Officer
Virgile Elana
Charlie Rumble
Emeson Nwolie
Double Bass Bob
Nicholas Lumley
Farmer Jack
Stephen McDade
Johnny Cashpoint
Cal McCrystal
Sir Geoffrey Wilcott
Jamie Demetriou
The Professor
Stewart Gilchrist
Chakrabatics Instructor
Justin Edwards
Dozy Policeman
Kya Garwood
Felicity Fanshawe's Assistant
Maggie Steed
Gertrude Biggleswade
Dan Antopolski
St. Paul's Guard
Gus Brown
St. Paul's Tour Guide
Jennie Legat
The First Madame Kozlova
John Shearer
Steam Fair Stall Holder (voice)
Hiten Patel
Office Executive (uncredited)
Jag Patel
Prisoner (uncredited)