It may refer to:

• Mary Poppins (book series), the original 1934–1988 children's fantasy novels that introduced the character.
• Mary Poppins (character), the nanny with magical powers.
• Mary Poppins (film), a 1964 Disney film starring Julie Andrews, based on the books.
  • Mary Poppins: Original Cast Soundtrack, the soundtrack album for the 1964 film.
• Mary Poppins Returns, a 2018 film starring Emily Blunt, and sequel to the 1964 film.
  • Mary Poppins Returns (soundtrack), the soundtrack album for the 2018 film.
• Mary Poppins, Goodbye, a 1983 Soviet musical film released by MOs film.
• Mary Poppins (musical), a 2004 British stage musical based on the books and film.