Who invented Mary Poppins? August 5, 2020 by Pamela Landy P. L. Travers invented Mary Poppins, in a series of books beginning with Mary Poppins in 1934. Related Answers What day was the official signing ceremony for the Declaration of Independence? Where and when did Mr. Smith Goes to Washington (1939) have its premiere? Did Typhoid Mary really exist? In how many movies did Humphrey Bogart, Mary Astor, and Sydney Greenstreet star together? How many spinoffs did “The Mary Tyler Moore Show” (CBS, 1970-77) have? How much time passed between Amy Fisher’s shooting of Mary Jo Buttafuoco and the premiere of the TV-movies on the subject?