"Refrain" is a song recorded by Swiss singer Lys Assia with music composed by Géo Voumard and lyrics written by Émile Gardaz. It represented Switzerland in the inaugural edition of the Eurovision Song Contest and became the first ever winner of the contest.

Lys Assia was a Swiss singer who won the first Eurovision Song Contest in 1956. Assia was born in Rupperswil, Aargau, and began her stage career as a dancer, but changed to singing in 1940 after successfully standing in for a female singer.