The Budapest Opera House, or Hungarian National Opera in Hungarian, is a neo-Renaissance opera house situated at 22 Andrássy Avenue in the heart of Budapest.

With a seating capacity of 2,400, the horseshoe-shaped theatre, which Miklos Ybl designed, was inaugurated in 1884 in the presence of Emperor Franz Joseph I and once competed with the Wiener Staatsoper (Vienna State Opera).

It now has 1289 seats after renovations and a capacity reduction in 1980.

From 1887 to 1891, Gustav Mahler, a composer and conductor, served as the theater's creative director, ushering in a golden age that also included Richard Strauss, Wilhelm Furtwängler, and Otto Klemperer (1947-50).

The Budapest Philharmonic Orchestra is the in-residence ensemble.

The larger Erkel Theatre, which alternates between ballet, concerts, and opera, is the second opera theatre in the city.