Il signor Bruschino, ossia Il figlio per azzardo (Signor Bruschino, or The Accidental Son) is a one act operatic farce (farsa giocosa per musica) by Gioachino Rossini to a libretto by Giuseppe Maria Foppa, based upon the 1809 play Le fils par hasard, ou ruse et folie by René de Chazet and Maurice Ourry.

Between 1810 and 1813, the young Rossini composed five pieces for the Teatro San Moisè, beginning with La cambiale di matrimonio (Bill of Exchange of Marriage), his first opera, and ending with Il signor Bruschino.

As compared with many genres of opera, acting and comedic talent is more important relative to the required singing ability.

Florville's father dies, removing one barrier, but Gaudenzio has already agreed to wed Sofia to the son of his old friend, Signor Bruschino senior.

On his way to meet Sofia, young Bruschino stops at a tavern, runs up an impressive bill and is detained when he is unable to pay.