La part du diable ("The Devil's Share," also known by the English title Carlo Broschi) is an opéra comique by Daniel Auber to a libretto by Eugène Scribe, loosely based on an incident from the life of the singer Farinelli.

The original production starred Sophie Anne Thillon and Celeste Darcier alternating in the role of Casilda.

The minstrel Carlo Broschi has hidden his sister Casilda in a convent to protect her from the machinations of the clergy who wish to make a present of her for King Ferdinand VI.

Casilda appeals to Carlo for protection; she has been kidnapped by the priests and brought to the king, who, only recently having recovered his sanity, takes her for a ghost.

Raphael, who has obtained an office due to Carlo's influence and has had uncommon luck at gambling, is so confident of supernatural aid that he is nonplussed at the king's entrance, even when the latter orders his death.