Syrinx, L. 129, is a piece of music for solo flute which Claude Debussy wrote in 1913.

Many musical historians believe that "Syrinx", which gives the performer generous room for interpretation and emotion, played a pivotal role in the development of solo flute music in the early twentieth century.

Syrinx was written as part of incidental music to the play Psyché by Gabriel Mourey, and was originally called "Flûte de Pan".

Syrinx, however, does not return the love to Pan; she turns herself into a water reed and hides in the marshes.

Pan cuts the reeds to make his pipes, in turn killing his love.