Armida is an opera by Antonín Dvořák in four acts, set to a libretto by Jaroslav Vrchlický that was originally based on Torquato Tasso's epic La Gerusalemme liberata. Dvořák's opera was first performed at Prague's National Theatre on 25 March 1904; the score was published as opus 115 in 1941. In terms of genre, Armida represents the culmination of Dvořák's experimentation with a Wagnerian style of opera composition, though much of the music belongs to Dvořák's own genre. Vrchlický's libretto parallels the one that Philippe Quinault wrote for Jean-Baptiste Lully in their opera of the same name.