Béatrice et Bénédict (Beatrice and Benedick) is an opéra comique in two acts by French composer Hector Berlioz. Berlioz wrote the French libretto himself, based in general outline on a subplot in Shakespeare's Much Ado About Nothing. Berlioz had been interested in setting Shakespeare's comedy since his return from Italy in 1833, but only composed the score of Béatrice et Bénédict following the completion of Les Troyens in 1858. It was first performed at the opening of the Theater Baden-Baden on 9 August 1862. Berlioz conducted the first two performances of a German version in Weimar in 1863, where, as he wrote in his memoirs, he was "overwhelmed by all sorts of kind attention." It is the first notable version of Shakespeare's play in operatic form, and was followed by works by, among others, Árpád Doppler, Paul Puget, Charles Villiers Stanford, and Reynaldo Hahn. Berlioz biographer David Cairns has written: "Listening to the score's exuberant gaiety, only momentarily touched by sadness, one would never guess that its composer was in pain when he wrote it and impatient for death".

Benvenuto Cellini is an opera semiseria in four tableaux (spread across two or three acts) by Hector Berlioz, his first full-length work for the stage. Premiered at the Académie Royale de Musique (Salle Le Peletier) on 10 September 1838, it is a setting of a libretto by Léon de Wailly and Henri Auguste Barbier, who invented most of the plot inspired by the memoirs of the Florentine sculptor Benvenuto Cellini. The opera is technically challenging and was until the 21st century rarely performed. However, the overture occasionally features in orchestral concerts, as does the concert overture Le carnaval romain which Berlioz composed from material in the opera.

Les Francs-juges (translated as The Free Judges or The Judges of the Secret Court) is the title of an unfinished opera by the French composer Hector Berlioz written to a libretto by his friend Humbert Ferrand in 1826. Berlioz abandoned the incomplete composition and destroyed most of the music. He retained the overture, which has become a popular concert item, and used some other musical material in later compositions.

Les Troyens (pronounced [le tʁwajɛ̃]; in English: The Trojans) is a French grand opera in five acts, running for about five hours, by Hector Berlioz. The libretto was written by Berlioz himself from Virgil's epic poem the Aeneid; the score was composed between 1856 and 1858. Les Troyens is Berlioz's most ambitious work, the summation of his entire artistic career, but he did not live to see it performed in its entirety. Under the title Les Troyens à Carthage, the last three acts were premièred with many cuts by Léon Carvalho's company, the Théâtre Lyrique, at their theatre (now the Théâtre de la Ville) on the Place du Châtelet in Paris on 4 November 1863, with 21 repeat performances. The reduced versions run for about three hours. After decades of neglect, today the opera is considered by some music critics as one of the finest ever written.