Sem Benelli was an Italian playwright, essayist and librettist. He provided the texts for several noted Italian operas, including Italo Montemezzi's L'amore dei tre re and L'incantesimo, and Umberto Giordano's La cena delle beffe, based on Benelli's own play of the same title. He was a native of Prato. His dramatic play of La Gorgona was first staged in Trieste in 1913.
