The National Moravian-Silesian Theatre (based in 1919) is the biggest and oldest professional theatre in Ostrava and the Moravian-Silesian region. The theatre has four artistic companies – opera, drama, ballet and operetta/musical, which regularly perform on two theatre scenes – the Antonín Dvořák Theatre (seating capacity of 517) and the Jiří Myron Theatre (seating capacity of 623). The theatre presents 16-19 premieres per year and plays almost 500 performances. The National Moravian-Silesian Theatre organises the festival of drama theatres OST-RA-VAR and also the event European Opera Days in Ostrava. The theatre also participates in NODO/New Opera Days Ostrava (biennial).
The City of Ostrava as the founder of the National Moravian-Silesian Theatre operates as its most significant donor. In addition, the Moravian-Silesian Region and the Ministry of Culture of the Czech Republic are two other significant donors of the theatre.