Rinaldo is an opera by George Frideric Handel composed in 1711. It is the first Italian language opera written specifically for the London stage. The libretto was prepared by Giacomo Rossi from a scenario provided by Aaron Hill. The work was first performed at the Queen's Theatre in London's Haymarket on 24 February 1711. The story of love, battle and redemption set at the time of the First Crusade is loosely based on Torquato Tasso's epic poem Gerusalemme liberata, and its staging involved many original and vivid effects. It was a great success with the public, despite negative reactions from literary critics hostile to the trend towards Italian entertainment in English theatres.
Handel composed the music for Rinaldo quickly. Much of it is borrowings and adaptations from operas and other works that Handel had composed during his long stay in Italy during 1706–10. In the years following the premiere, Handel frequently introduced new numbers, discarded others, and transposed parts to different voice ranges. Despite the lack of a standard edition, Rinaldo's spectacular vocal and orchestral passages make it one of Handel's greatest operas.