The Bolshoi Theatre is a historic opera house in Moscow, Russia, originally designed by architect Joseph Bové. Before the October Revolution it was a part of the Imperial Theatres of the Russian Empire along with Maly Theatre in Moscow and a few theatres in Saint Petersburg.

An opera house is a theater building used for performances of opera. Like many theaters, it usually includes a stage, an orchestra pit, audience seating, backstage facilities for costumes and building sets, as well as offices for the institution's administration.