Bomarzo is an opera in two acts by Alberto Ginastera, his Opus 34, to a Spanish libretto by Manuel Mujica Laínez, based on his 1962 novel about the 16th-century Italian eccentric Pier Francesco Orsini. The opera had its world premiere at the Opera Society of Washington, Washington D.C., on 19 May 1967. The same production was first given at New York City Opera on 14 March 1968. The work had been scheduled for its first performance in Argentina on 4 August 1967 at the Teatro Colón, but the Argentine president, Juan Carlos Onganía, had banned the production, objecting to the sexual content of the story. The first performance in Argentina did not occur until 1972, with the composer in attendance. The first UK production was at English National Opera on 3 November 1976, in an English translation by Lionel Salter.

Librettist Manuel Mujica Laínez (based on his 1962 novel about the 16th-century Italian eccentric Pier Francesco Orsini.)
Date of composition 1967 (1966-1967)
Premiered 1967, May 19th (Opera Society of Washington) in Washington, DC, United States
Type Opera
Catalogue Op. 34
Spoken language Spanish
Instruments Voice (Tenor) - Pier Francesco Orsini, Duke of Bomarzo
Voice (Baritone) - Girolamo, elder brother of Pier Francesco
Voice (Baritone) - Maerbale, younger brother of Pier Francesco
Voice (Bass) - Bomarzo's father
Voice (Contralto) - Bomarzo's grandmother
Voice (Mezzo-Soprano) - Pantasilea, courtesan of Florence
Voice (Soprano) - Julia Farnese, the Duke's wife
Voice (Baritone) - Silvio de Narni, alchemist to the Duke
Silent Role - Abul, slave to Bomarzo
Silent Role - Nicolas, nephew to Bomarzo
Autotranslations beta Alberto Ginastera: Bomarzo, Op. 34
Alberto Ginastera: Bomarzo, Op. 34
Alberto Ginastera: Bomarzo, Op. 34