La niña de la mochila azul (in English: The girl with the blue backpack) is a 1979 Mexican motion picture, based on the song La de la Mochila Azul from the album by the same name, performed by Pedrito Fernández. This film is categorized as a Musical, Drama and Comedy.

This was the first film starred in by Pedro Fernández credited as Pedrito Fernández when he was a child. At age seven, prior to the making of the movie, Pedro recorded La de la Mochila Azul and the success of that song was so great that he came to star in the subsequent iconic film. That song became the title track of this movie and a long distinguished career as an actor and singer continued.

The movie became an immediate success and resulted in a continuation with the La niña de la mochila azul 2. Both films also starred the popular comedian Adalberto Martínez as 'Resortes', and María Rebeca as Amy, the girl with the blue backpack. The popular song is still requested by fans at Pedro Fernández concerts today and the movie is still popular as a classic. Filmed near the infamous cascadas in Muzquiz, Coahuila - El Oasis Del Norte.