Giunio Bruto (Italian, Junius Brutus) is a 1781 opera seria in two acts by Domenico Cimarosa to a libretto by Eschilo Acanzio. The opera was premiered in 1781 at the opening of Teatro Filarmonico in Verona. During the next two years further performances were given at Genoa, Siena and Pisa. In 1788, Joseph Haydn produced the opera at Esterháza; but despite a lavish staging and alterations to the score by Haydn himself, the production was not successful.