"Poupée de cire, poupée de son" (French pronunciation: ​[pupe də siʁ pupe də sɔ̃]; English: "Wax doll, rag doll") is a song written by Serge Gainsbourg and recorded by French singer France Gall. It is best known as the Luxembourgian winning entry at the Eurovision Song Contest 1965, held in Naples.

The song was inspired by the 4th movement (Prestissimo in F minor) from Beethoven's Piano Sonata No. 1. It was nominated as one of the 14 best Eurovision songs of all time at the Congratulations special held in October 2005.

As is common with Gainsbourg's lyrics, the words are filled with double meanings, wordplay, and puns. The title can be translated as "wax doll, rag doll" (a floppy doll stuffed with bran or chaff) or as "wax doll, sound doll" (with implications that Gall is a "singing doll" controlled by Gainsbourg).

Sylvie Simmons wrote that the song is about "the ironies and incongruities inherent in baby pop"—that "the songs young people turn to for help in their first attempts at discovering what life and love are about are sung by people too young and inexperienced themselves to be of much assistance, and condemned by their celebrity to be unlikely to soon find out."

This sense of being a "singing doll" for Gainsbourg reached a peak when he wrote "Les Sucettes" ("Lollipops") for Gall.

The day after her Eurovision victory the single had sold 16,000 copies in France, four months later it had sold more than 500,000 copies.