Lithuanian National Opera and Ballet Theatre (LNOBT) (Lithuanian: Lietuvos nacionalinis operos ir baleto teatras), founded as Operos vaidykla, is an opera house and ballet theatre in Vilnius, Lithuania.

[2] The premiere, Verdi's La Traviata, was performed on 31 December of that year, which is now regarded as the anniversary of the theatre.

[1] The theatre moved to a brand new building on the banks of the Neris River in 1974, designed by architect Elena Nijolė Bučiūtė (born 1930), after she had won an architectural competition in 1960.

The stage had been modernised since 1974, but services needed upgrading, so the new renovations included roof refurbishment and insulation; replacement of the glass of the external facade as well as windows and skylights; modernisation of the heating and hot water systems; and upgrading the ventilation and lighting systems.

Vytautas Klova's opera Pilėnai (1956), has since 2001 been performed outdoors during the summer at Trakai Island Castle.