Fallen Fairies; or, The Wicked World, is a two-act comic opera, with a libretto by W. S. Gilbert and music by Edward German. The story is an operatic adaptation of Gilbert's 1873 blank-verse fairy comedy, The Wicked World. In Fairyland, the fairies are curious about wicked mortals, especially their strange capacity for love. They summon three mortal men from the world below to observe them and to teach the men how to live virtuously. The fairies fall in love with the mortals, become jealous of each other and behave badly. The men return to Earth, and the fairies realize that love is overrated.
The piece premiered at London's Savoy Theatre on 15 December 1909. Gilbert directed the opera. Charles Herbert Workman produced and starred as Lutin. The cast also starred Gilbert protégée Nancy McIntosh as Selene, the Fairy Queen. McIntosh received negative reviews, and Workman soon replaced her with Amy Evans and made changes in the play that angered Gilbert, who sued Workman. Despite better reviews for Evans, the work did not please the critics, or ultimately the audiences. It failed, closing after just 50 performances. Neither Gilbert nor German would write another opera.