"Le cygne", pronounced [lə siɲ], or "The Swan", is the 13th and penultimate movement of The Carnival of the Animals by Camille Saint-Saëns. Originally scored for solo cello accompanied by two pianos, it has been arranged and transcribed for many instruments but remains best known as a cello solo. The piece is in 6/4 (time signature), with a key signature of G major and a tempo marking andantino grazioso. The slow cello melody is accompanied by almost constant broken chord figurations on the pianos. When performed as a separate movement, not in the context of The Carnival, "The Swan" is frequently played with accompaniment on only one piano.

This is the only movement from The Carnival of the Animals that the composer allowed to be played in public during his lifetime. He thought the remaining movements were too frivolous and would damage his reputation as a serious composer.

"Le cygne" illustrates the fleeting nature of beauty with its interpretation of the legend of the "swan song": A popular belief among the ancient Greeks, who regarded the swan as among the most beautiful of animals,was that the mute swan is silent until its final moments of life, during which it sings the most beautiful of all birdsongs.