Falstaff is a comic opera in three acts by the Italian composer Giuseppe Verdi. The Italian-language libretto was adapted by Arrigo Boito from the play The Merry Wives of Windsor and scenes from Henry IV, Part 1 and Part 2, by William Shakespeare. The work premiered on 9 February 1893 at La Scala, Milan.

Opera is a form of theatre in which music is a fundamental component and dramatic roles are taken by singers. Such a "work" is typically a collaboration between a composer and a librettist and incorporates a number of the performing arts, such as acting, scenery, costume, and sometimes dance or ballet. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble, which since the early 19th century has been led by a conductor. Although musical theatre is closely related to opera, the two are considered to be distinct from one another.