Luxembourg was represented at the Eurovision Song Contest 1965 with the song "", written by Serge Gainsbourg, and performed by French singer France Gall. The Luxembourgish participating broadcaster, the (CLT), selected its entry through a national final, after having previously selected the performer internally. The song went on to win the contest, bringing Luxembourg their second Eurovision victory.
=== === was the finale to a series organised by RTL to find the best television presenter out of three candidates. The finale of was broadcast live on 21 February 1965 from the Grand Auditorium de la Villa Louvigny, Luxembourg City and was hosted by Jacques Navadic. Although the actual premise of the show was unrelated to the Eurovision Song Contest, France Gall performed an interval act during the show in which she performed four songs and one was chosen to represent Luxembourg at the Eurovision Song Contest 1965.
The contest was broadcast on .
On the night of the final Gall performed 15th in the running order, following and preceding . In the voting led from start to finish, gaining 32 points and winning by a 6-point margin over "I Belong" from the .
"Poupee de cire, poupée de son" was one of the fourteen Eurovision songs chosen by fans to compete in the Congratulations 50th anniversary special in 2005. Gall did not appear at the event, nor did Luxembourg (who withdrew from competing in Eurovision after 1993) broadcast it. The song appeared ninth in the running order, following "Fly on the Wings of Love" by the Olsen Brothers and preceding "Everyway That I Can" by Sertab Erener. Like the other songs on the evening, it was represented by dancers performing alongside video footage of Gall's original performance. At the end of the first round, "Poupee de cire, poupee de son" was not announced as one of the five songs proceeding to the second round. It was later revealed that the song finished fourteenth and last, scoring 37 points.