The Royal Opera of Versailles is the main theatre and opera house of the Palace of Versailles. The Royal Opera is one of the greatest works by the architect Ange-Jacques Gabriel. Inaugurated in 1770 during the reign of Louis XV, it was at the time the largest concert hall in Europe, and was also a great technical achievement and an impressive feat of decorative refinement. A theatre for monarchic and then republican life, it has hosted celebrations, shows and parliamentary debates.

Designed by Ange-Jacques Gabriel, it is also known as the Théâtre Gabriel. The interior decoration by Augustin Pajou is constructed almost entirely of wood, painted to resemble marble in a technique known as faux marble. The excellent acoustics of the opera house is at least partly due to its wooden interior.

The house is located at the northern extremity of the north wing of the palace. General public access to the theater is gained through the two-story vestibule. Some parts of the Opéra, such as the King's Loge and the King's Boudoir represent some of the earliest expressions of what would become known as the Louis XVI style.

Lully’s Persée — written in 1682, the year Louis XIV moved into the palace — inaugurated the Opéra on 16 May 1770 in celebration of the marriage of the dauphin — the future Louis XVI — to Marie Antoinette.

The Opéra Royal can serve either as a theater for opera, stage plays, or orchestral events, when it can accommodate an audience of 712 or as a ballroom when the floor of the orchestra level of the auditorium can be raised to the level of the stage. On these occasions, the Opéra can accommodate 1,200.