Opera buffa is a genre of opera. It was first used as an informal description of Italian comic operas variously classified by their authors as commedia in musica, commedia per musica, dramma bernesco, dramma comico, divertimento giocoso.

Opéra comique is a genre of French opera that contains spoken dialogue and arias. It emerged from the popular opéras comiques en vaudevilles of the Fair Theatres of St Germain and St Laurent, which combined existing popular tunes with spoken sections. Associated with the Paris theatre of the same name, opéra comique is not necessarily comical or shallow in nature; Carmen, perhaps the most famous opéra comique, is a tragedy.