Carmen is an opera in four acts by the French composer Georges Bizet. The libretto was written by Henri Meilhac and Ludovic Halévy, based on a novella of the same title by Prosper Mérimée. The opera was first performed at the Opéra-Comique in Paris, on 3 March 1875, and was not at first particularly successful; its initial run extended to 36 performances. Before this run was concluded, Bizet died suddenly, and thus knew nothing of the opera's later celebrity.

The opera, written in the genre of opéra comique with musical numbers separated by dialogue, tells the story of the downfall of Don José, a naive soldier who is seduced by the wiles of the fiery gypsy Carmen. José abandons his childhood sweetheart and deserts from his military duties, yet loses Carmen's love to the glamorous toreador Escamillo after which José kills her in a jealous rage. The depictions of proletarian life, immorality and lawlessness, and the tragic outcome in which the main character dies on stage, broke new ground in French opera and were highly controversial. After the premiere most reviews were critical, and the French public was generally indifferent. Carmen initially gained its reputation through a series of productions outside France, and was not revived in Paris until 1883; thereafter it rapidly acquired celebrity at home and abroad, and continues to be one of the most frequently performed operas; the "toreador's song" from Act 2 is among the best known of all operatic arias. Later commentators have asserted that Carmen forms the bridge between the tradition of opéra comique and the realism or verismo that characterised late 19th-century Italian opera.