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. Originally built with 3,000 seats, it was named the Théâtre Impérial du Châtelet, but has undergone remodeling and name changes over the years. Currently it seats 2,500 people.