Armide (Lully)

For other works with the same title, see Armide (disambiguation).
Lully's Armide at the Palais-Royal Opera House in 1761, watercolor by Gabriel de Saint-Aubin

Armide is an opera in five acts by Jean-Baptiste Lully. The libretto by Philippe Quinault is based on Torquato Tasso's poem La Gerusalemme liberata (Jerusalem Delivered). The work is in the form of a tragédie en musique, a genre invented by Lully and Quinault.

Critics in the 18th century regarded Armide as Lully's masterpiece. It continues to be well-regarded, featuring some of the best-known music in French baroque opera and being arguably ahead of its time in its psychological interest. Unlike most of his operas, Armide concentrates on the sustained psychological development of a character – not Renaud, who spends most of the opera under Armide's spell, but Armide, who repeatedly tries without success to choose vengeance over love.