Étienne Victor Tréfeu (de Tréval) (born Saint-Lô, Manche, September 25, 1821 – died Paris, June, 1903), was a French librettist, song writer and theatre manager. He is best known for his work with Jacques Offenbach. He originally came to prominence as a writer of popular songs. In 1873 he became the administrator of the Théâtre de la Gaîté in Paris.