The Théâtre du Châtelet is a theatre and opera house, located in the place du Châtelet in the 1st arrondissement of Paris, France.
One of two theatres built on the site of a châtelet, a small castle or fortress, it was designed by Gabriel Davioud at the request of Baron Haussmann between 1860 and 1862.
The theatre is one of two apparent twins constructed along the quays of the Seine, facing each other across the open Place du Châtelet and its ornate fountain. The other is the Théâtre de la Ville .
Since 1979, it has been operated by the City of Paris, and, after undergoing a major restoration, re-opened under the name of the Théâtre Musical de Paris in 1980. It was acoustically re-modeled again in 1989 and reverted to the Théâtre du Châtelet name. It is currently mainly used for opera performances and concerts.