Votre Faust (Your Faust) is an opera (or, more precisely, a "variable fantasy in the style of an opera") in two acts by the Belgian composer Henri Pousseur, for five actors, four singers, twelve instrumentalists, and tape. The text is by the French author Michel Butor. Originally written between 1960 and 1968, it was premiered on 15 January 1969 at the in Milan, and revised in 1981. Although about seven hours of performable material exists, the variable structure does not permit use of it all in a single version, and performances to date have been between three and three-and-a-half hours.