Il trovatore (The Troubadour) is an opera in four acts by Giuseppe Verdi to an Italian libretto by Salvadore Cammarano, based on the play El Trovador (1836) by Antonio García Gutiérrez. Cammarano died in mid-1852 before completing the libretto. This gave the composer the opportunity to propose significant revisions, which were accomplished under his direction by the young librettist Leone Emanuele Bardare, and they are seen largely in the expansion of the role of Leonora.
The opera was first performed at the Teatro Apollo, Rome, on 19 January 1853 where it "began a victorious march throughout the operatic world". Today it is given very frequently and is a staple of the standard operatic repertoire. It appears at number 23 on the Operabase list of the most-performed operas worldwide.