"Supercalifragilisticexpialidocious" is a song and single from the 1964 Disney musical film Mary Poppins. It was written by the Sherman Brothers, and sung by Julie Andrews and Dick Van Dyke. It also appears in the 2004 stage show version. Because Mary Poppins was a period piece set in 1910, songs that sounded similar to songs of the period were wanted. The movie version finished at #36 in AFI's 100 Years...100 Songs survey of top tunes in American cinema.

Mary Poppins is a 1964 American musical fantasy comedy film directed by Robert Stevenson and produced by Walt Disney, with songs written and composed by the Sherman Brothers. The screenplay is by Bill Walsh and Don DaGradi, based on P. L. Travers's book series Mary Poppins. The film, which combines live-action and animation, stars Julie Andrews in her feature film debut as Mary Poppins, who visits a dysfunctional family in London and employs her unique brand of lifestyle to improve the family's dynamic. Dick Van Dyke, David Tomlinson, and Glynis Johns are featured in supporting roles. The film was shot entirely at the Walt Disney Studios in Burbank, California, using painted London background scenes.