Live-action cast
Julie Andrews as Mary Poppins, a magical and loving woman who descends from the clouds in response to the Banks children's advertisement for a nanny. She is firm in her use of authority but gentle and kind as well, a major departure from the original books, in which the character was more stern and pompous.
Dick Van Dyke as Bert, a cockney-speaking jack of all trades and Mary Poppins' closest friend, who is completely accustomed to her magic. Their playful interactions imply that they have known each other for a long time and that this kind of story has repeated itself many times. Bert has at least four jobs throughout the film: a one-man band, a sidewalk chalk artist, a chimney sweep, and a kite seller.
Van Dyke also portrays Mr. Dawes Sr., the old director of the bank where Mr. Banks works. During the film's end titles, "Navckid Keyd", an anagram of Dick Van Dyke, is first credited as playing the role before the letters unscramble to reveal Van Dyke's name.
David Tomlinson as George Banks, Mary Poppins' employer and strict, driven, and disciplined father of Jane and Michael. He works at the Dawes Tomes Mousley Grubbs Fidelity Fiduciary Bank in London.
Glynis Johns as Winifred Banks, the easily distracted wife of George Banks and the mother of Jane and Michael. She is depicted as a member of Emmeline Pankhurst's "Votes for Women" suffrage movement, although she is mild and subservient with her husband. Mrs. Banks was originally named Cynthia, but this was changed to the more English-sounding Winifred per Travers.
Hermione Baddeley as Ellen, the maid of the Banks residence
Reta Shaw as Mrs. Clara Brill, the cook of the Banks residence
Karen Dotrice as Jane Banks, the daughter of Mr. and Mrs. Banks and Michael's older sister. Jane is a high-spirited, bright, and precocious young girl. Dotrice makes a cameo appearance in Mary Poppins Returns (2018) as a different character.
Matthew Garber as Michael Banks, the son of Mr. and Mrs. Banks and Jane's younger brother. Michael is an excitable and naughty young boy who simply adores and looks up to his father. Both Jane and Michael are mischievous and misbehave in an attempt to seek attention from their parents.
Elsa Lanchester as Katie Nanna, the disgruntled nanny who quits the Banks family
Arthur Treacher as Constable Cody Jones, a police officer
Reginald Owen as Admiral Boom, the Bankses' eccentric neighbor and a naval officer. He has his first mate, Mr. Binnacle, fire a cannon from his roof every 8 a.m. and 6 p.m.
Ed Wynn as Uncle Albert, a jolly gentleman who suffers from an unknown condition where he floats in the air due to his uncontrollable laughter. Although he likes having company over, he becomes sad and cries when his guests have to leave and he falls back to the ground, since it is the inversion of laughing.
Jane Darwell as the "Bird Woman", an old woman who sells breadcrumbs for the pigeons on the steps of St. Paul's Cathedral
Arthur Malet as Mr. Dawes Jr., the director's son and member of the board
James Logan as a doorman who chases after the children in the bank
Don Barclay as Mr. Binnacle, Admiral Boom's first mate
Alma Lawton as Mrs. Corry, an old shopkeeper of a gingerbread shop and mother of two very tall daughters
Marjorie Eaton as Miss Molly Persimmon
Marjorie Bennett as Miss Lark, owner of the dog named Andrew, who frequently runs away
Cyril Delevanti as Mr. Grubbs (uncredited)
Lester Matthews as Mr. Tomes (uncredited)
Betty Lou Gerson as old crone (uncredited)
Kay E. Kuter as man in bank (uncredited)
Doris Lloyd as depositor (uncredited)
Queenie Leonard as depositor (uncredited)
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