"A Man Has Dreams" is a song from Walt Disney's film Mary Poppins, written by Richard M. Sherman and Robert B. Sherman. The song melody is a slowed down version of "The Life I Lead" which serves as Banks' leit motif. In both the motion picture and the stage musical, the song is performed as a conversational duet between Bert, the chiminey sweep (Dick Van Dyke) and George Banks (David Tomlinson). It is operatic in nature, sung dialogue, and was highly unusual for a musical film of that era. The song incorporates a reprise of "A Spoonful of Sugar" which is Mary Poppins' leit motif.

The melody first appears as George Banks marches into the front door of his home. At that point in the film, the song is bouncy in nature to reflect Banks' triumphant spirit. The song is then titled, "The Life I Lead". It is reprised several times throughout the film. The final reprise is sung when Banks thinks he has lost everything, during which the music somber and the song itself retitled as, "A Man Has Dreams".

This song is pivotal in both the stage musical as well as the film.