The National Moravian-Silesian Theatre (Czech: Národní divadlo moravskoslezské; NDM) is a professional theatre company based in Ostrava in the Czech Republic.

It is one of ten opera houses in the country, and the largest theatre company in the Moravian-Silesian Region.

The company was registered in 1918, and the theatre was first opened to the public on 19 August 1919.

The theatre consists of four artistic companies: drama, opera, operetta/musical, and ballet.

[1] The current director of the theatre is Jiří Nekvasil, and the artistic directors of the four companies are Jakub Klecker (opera), Vojtěch Štěpánek (drama), Lenka Dřímalová (ballet), and Gabriela Petráková (operetta/musical).