The Young Girls of Rochefort (French: Les Demoiselles de Rochefort, lit. 'The Young Ladies of Rochefort') is a 1967 French musical comedy film written and directed by Jacques Demy. The ensemble cast is headlined by real-life sisters Catherine Deneuve and Françoise Dorléac, and features George Chakiris, Michel Piccoli, Jacques Perrin, Grover Dale and Geneviève Thénier, along with Gene Kelly and Danielle Darrieux.

Michel Legrand composed the score for the film, to Demy's lyrics. The most famous songs from the film are "A Pair of Twins" ("Chanson des Jumelles") and Maxence's Song ("Chanson de Maxence"), which was later relyricized by Alan and Marilyn Bergman as "You Must Believe in Spring". The dance sequences were choreographed by Norman Maen.

The film was a success for Demy in his native France, with 1,319,432 admissions, and was nominated for the Academy Award for Best Scoring of a Musical Picture — Original or Adaptation at the 41st Academy Awards.

A stage musical based on the film was produced in France in 2003, adapted by Alain Boublil and directed by Daniel Moyne.