Le 66 is an opérette in one act of 1856 with music by Jacques Offenbach. The French libretto was by Pittaud de Forges and Laurencin (Paul Aimé Chapelle). Gänzl describes the work as "in the rustic vein of Le violoneux and Le mariage aux lanternes".

The premiere was at the Théâtre des Bouffes Parisiens (Salle Lacaze) Paris, on 31 July 1856, one of nine one-acters produced by the Bouffes Parisiens that year. Le 66 remained in the Bouffes Parisiens repertoire, and was played by them in Vienna in 1862. It had already been seen at the Carltheater in that city in 1859, was produced in Budapest in 1860, and mounted in London in 1865 and 1876. It was revived in Paris in 1984 at the Studio Bertrand alongside Pépito.

Contemporary critics particularly admired in the score the romance and tyrolienne and the entry song of the colporteur.