Marie-Juliette Olga ("Lili") Boulanger (21 August 1893 – 15 March 1918) was a French composer, and the first female winner of the Prix de Rome composition prize. Her older sister was the noted composer and composition teacher Nadia Boulanger.

As a Parisian-born child prodigy, Boulanger's talent was apparent at the age of two, when Gabriel Fauré, a friend of the family and later one of Boulanger's teachers, discovered she had perfect pitch. Her parents, both of whom were musicians, encouraged their daughter's musical education.

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