Julie Andrews as Mary Poppins

Dick Van Dyke as Bert / Mr. Dawes Sr.

David Tomlinson as Mr. Banks

Glynis Johns as Mrs. Banks

Hermione Baddeley as Ellen

Karen Dotrice as Jane Banks

Matthew Garber as Michael Banks

Elsa Lanchester as Katie Nanna

Arthur Treacher as Constable

Reginald Owen as Admiral Boom

Ed Wynn as Uncle Albert

Reta Shaw as Mrs. Brill

Arthur Malet as Mr. Dawes Jr.

Jane Darwell as Bird Woman

James Logan as Bank Doorman

Don Barclay as Mr. Binnacle

Alma Lawton as Mrs. Corry

Marjorie Eaton as Miss Persimmon

Marjorie Bennett as Miss Lark

Doris Lloyd as Depositor (uncredited)