She played the title character in Mary Poppins, which earned her an Academy Award for Best Actress. She also played Queen Clarisse Renaldi in The Princess Diaries and The Princess Diaries 2: Royal Engagement. She later played the Narrator in Enchanted. She also posed as the Blue Fairy in "Where Magic Begins" in the Disney Dream Portrait Series.
- She also played Maria in The Sound of Music. Her appearance in this film become the inspiration for Disney character Belle.
- Her role as Mary Poppins from Mary Poppins was spoofed by Genie in the TV series Aladdin.
- She provided the whistling for the audio animatronic bird in the song "A Spoonful of Sugar".
- Walt Disney chose her for the role of Mary Poppins for her ability to whistle.