Assassinio nella cattedrale (Murder in the Cathedral) is an opera in two acts and an intermezzo by the Italian composer Ildebrando Pizzetti, who also wrote the libretto. He adapted it from an Italian translation of T. S. Eliot's 1935 play Murder in the Cathedral. The opera was premiered at La Scala, Milan, on 1 March 1958. The opera was performed for the first time in Canada the following year at the Montreal Festivals.