Die Rheinnixen (French: Les fées du Rhin; English The Rhine Nixies) is a romantic opera in four acts by Jacques Offenbach. The original libretto by Charles-Louis-Étienne Nuitter was translated into German by . The Elves' Song from Die Rheinnixen was later used in The Tales of Hoffmann, where it became the "Barcarolle" (Belle nuit, ô nuit d'amour) in the 'Giulietta' act; Conrad's drinking song was also re-used in the same act.