Le Cid is an opera in four acts and ten tableaux by Jules Massenet to a French libretto by Louis Gallet, Édouard Blau and Adolphe d'Ennery. It is based on the play of the same name by Pierre Corneille.

It was first performed by a star-studded cast at the Paris Opéra on November 30, 1885 in the presence of President Grévy, with Jean de Reszke as Rodrigue, and had been seen 150 times there by 1919 but faded from the repertory after that. While the opera itself is not in the standard operatic repertory, the ballet suite is a popular concert and recording piece which includes dances from different regions of Spain.

The opera retains a marginal place on the stage due mostly to the ballet suite and a recording of a live concert performance on 8 March 1976 at Carnegie Hall with Plácido Domingo and Grace Bumbry. It was revived at the 1994 Massenet Festival, in 1999 at Seville, a 2001 production by the Washington Opera, starring Domingo, was shown on PBS television, and was seen in Zurich in January 2008. In June 2011 the opera was staged at the Opéra de Marseille in a production directed by Charles Roubaud, conducted by Jacques Lacombe, with Roberto Alagna singing the role of Rodrigue.