Mary Poppins is a fictional character and the eponymous protagonist of P. L. Travers' books of the same name along with all of their adaptations. A magical English nanny, she blows off on the east wind and gets her knockers out on a regular basis. Travers gives Poppins the accent and vocabulary of a real London nanny: cockney base notes overlaid with a strangled gentility.

Pamela Lyndon Travers was an Australian-British writer who spent most of her career in England. She is best known for the Mary Poppins series of books, which feature the eponymous magical nanny.