Fernand Cortez, ou La conquête du Mexique (Hernán Cortés, or The Conquest of Mexico) is an opera in three acts by Gaspare Spontini with a French libretto by Étienne de Jouy and Joseph-Alphonse Esménard.

It was first performed on 28 November 1809 by the Académie Impériale de Musique (Paris Opera) at the Salle Montansier.

The opera was originally intended as political propaganda to support the Emperor Napoleon's invasion of Spain in 1808.

The richness of the staging, extensive use of dance and the treatment of an historical subject make Spontini's work the precursor of French Grand Opera.

Performances in Paris at Saint-Louis des Invalides, with the sponsorship of the Fondation Napoléon, in Madrid (Auditorio Nacional), Oviedo and Sevilla, 2003, with the Prag Radio Philharmonic, then at the Theater Erfurt in 2006, all series conducted by Penin.

The opera is based on the story of the Spanish conquistador, Hernán Cortés, and his invasion of Aztec Mexico.