In 1952, she auditioned for the starring role of Princess Aurora in the then-upcoming Disney film, Sleeping Beauty. Walt Disney called her personally within hours of the audition to inform her that the part was hers. Her role in Sleeping Beauty remains her most successful, renowned and critically acclaimed film role to-date. She continues to do promotional appearances for Disney, most recently for the Blu-ray release of Sleeping Beauty.
- She is one of three original voice actresses of the three original Disney Princesses; the other two being Adriana Caselotti (Snow White) and Ilene Woods (Cinderella).
- She is the only actress of the original three Disney princesses to still be alive. Both Adriana Caselotti and Ilene Woods have passed away.
- She is also the only surviving cast member of Sleeping Beauty.
- Cummings, David (ed.), "Costa, Mary, International Who's Who in Classical Music, Routledge, 2003, p. 158. ISBN 185743174X
- Hayes, John "2 with Futures to Follow: Mary Costa and Marilyn Horne", Billboard 16 May 1964 p. 38
- Hollis, Tim and Ehrbar, Greg, Mouse tracks: the story of Walt Disney Records, Univ. Press of Mississippi, 2006, p. 52. ISBN 1578068495
- Kennedy, Michael and Bourne, Joyce, "Costa, Mary", The Concise Oxford Dictionary of Music, Oxford University Press, 1996. (accessed via Encyclopedia.com. 26 January 2010)
- Metropolitan Opera, Performance Record: Costa, Mary (Soprano), on the MetOpera Database
- Sleeman, Elizabeth (ed.), "Costa, Mary" The International Who's Who of Women, Routledge, 2001, p. 116. ISBN 1857431227
- The Walt Disney Company, Disney Legends: Mary Costa (accessed 26 January 2010)
- Mary Costa at the Internet Movie Database