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 by William Shakespeare. The work premiered on 9 February 1893 at La Scala, Milan.

Verdi wrote Falstaff, the last of his 28 operas, as he approached the age of 80. It was his second comedy, and his third work based on a Shakespeare play, following Macbeth and Otello. The plot revolves around the thwarted, sometimes farcical, efforts of the fat knight Sir John Falstaff to seduce two married women.