Pier Francesco Orsini, also called Vicino Orsini, was an Italian condottiero, patron of the arts, and duke of Bomarzo. He is famous as the commissioner of the Mannerist Park of the Monsters in Bomarzo.

The Sacro Bosco, colloquially called Park of the Monsters, also named Garden of Bomarzo, is a Mannerist monumental complex located in Bomarzo, in the province of Viterbo, in northern Lazio, Italy.