Emily Blunt Mary Poppins Ben Whishaw Michael Banks Emily Mortimer Jane Banks Pixie Davies Annabel Banks Nathanael Saleh John Banks Lin-Manuel Miranda Jack Joel Dawson Georgie Banks Julie Walters Ellen Meryl Streep Tatiana "Topsy" Topotrepolovsky Colin Firth William "Weatherall" Wilkins / Wolf (voice) Jeremy Swift Hamilton Gooding / Badger (voice) Dick Van Dyke Mr. Dawes Jr. Angela Lansbury Balloon Lady David Warner Admiral Boom Jim Norton Mr. Binnacle Noma Dumezweni Miss Penny Farthing Tarik Frimpong Angus Sudha Bhuchar Miss Lark Steve Nicolson Park Keeper Christian Dixon The Milkman Christopher Godwin Information Desk Clerk John Dagleish Courier Karen Dotrice Lady On Cherry Tree Lane Ian Conningham Pub Landlord Billy Barratt Street Urchin Chris O'Dowd Shamus the Coachman Dog (voice) Mark Addy Clyde the Horse (voice) Craig Stein Leerie Bernardo Santos Fun Fair Couple (uncredited) Bern Collaço Bank Teller (uncredited) Rachel Muldoon Female Dancer Antonio Raul Corbo Boy (uncredited)