Il trovatore (pronounced [il trovaˈtoːre]; Italian for "The Troubadour") is an opera in four acts by Giuseppe Verdi to an Italian libretto largely written by Salvadore Cammarano, based on the play El trovador (1836) by Antonio García Gutiérrez. It was Gutiérrez's most successful play, one which Verdi scholar Julian Budden describes as "a high flown, sprawling melodrama flamboyantly defiant of the Aristotelian unities, packed with all manner of fantastic and bizarre incident."

The premiere took place at the Teatro Apollo in Rome on 19 January 1853, where it "began a victorious march throughout the operatic world," a success due to Verdi's work over the previous three years. It began with his January 1850 approach to Cammarano with the idea of Il trovatore. There followed, slowly and with interruptions, the preparation of the libretto, first by Cammarano until his death in mid-1852 and then with the young librettist Leone Emanuele Bardare, which gave the composer the opportunity to propose significant revisions, which were accomplished under his direction. These revisions are seen largely in the expansion of the role of Leonora.