- Emily Blunt Mary Poppins
- Lin-Manuel Miranda Jack
- Meryl Streep Topsy
- Ben Whishaw Michael Banks
- Colin Firth William Weatherall Wilkins
- Dick Van Dyke Sr. Dawes Jr.
- Emily Mortimer Jane Banks
- Julie Walters Ellen
- Pixie Davies Anabel
- Jeremy Swift Gooding
- Angela Lansbury Balloon Lady
- David Warner Admiral Boom
- Jim Norton Binnacle
- Steve Nicolson Park Keeper
- Chris O'Dowd Shamus the Coachman (voz)
- Mark Addy Clyde the Horse (voz)
- Noma Dumezweni Miss Penny Farthing
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