Achille-Claude Debussy (French pronunciation: ) (August 22, 1862 – March 25, 1918) was a French composer. Along with Maurice Ravel, he was one of the most prominent figures working within the field of impressionist music, though he himself intensely disliked the term when applied to his compositions. Debussy is not only among the most important of all French composers but also a central figure in European music at the turn of the twentieth century.

His music is noted for its sensory component and how it is not often formed around one key or pitch. Often Debussy's work reflected the activities or turbulence in his own life. His music virtually defines the transition from late-Romantic music to twentieth century modernist music. In French literary circles, the style of this period was known as symbolism, a movement that directly inspired Debussy both as a composer and as an active cultural participant.