Il giovedì grasso is a farsa in one act by Gaetano Donizetti, from a libretto by Domenico Gilardoni. The literal translation of the title is "Fat Thursday", a reference to Carnival celebration. The libretto was adapted from the French comedies Monsieur de Pourceaugnac by Molière and Le nouveau Pourceaugnac by Charles-Gaspard Delestre-Poirson and Eugène Scribe. The opera uses spoken dialogue rather than recitatives, and the buffo role is given in the Neapolitan language. The work premiered at the Teatro del Fondo in Naples on 26 February 1829.