The Co-Cathedral of the Assumption of the Virgin Mary (Czech: Konkatedrála Nanebevzetí Panny Marie; also called Our Lady of the Assumption Co-Cathedral[1] or simply Opava Cathedral) is a Gothic church in the historic city centre of Opava in the Czech Republic.

[2] Its construction is believed to have started during the reign of the Bohemian King Ottokar I (1198–1230).

But, a letter from King Wenceslaus I, dated 12 May 1237, already mentions the rectory in Opava.

Over time, the church underwent some additional Baroque and neo-Gothic modifications, suffered from fires in 1689 and 1759, and survived heavy shelling from the Red Army during World War II.

[3] In 1995, the building was declared a national cultural monument of the Czech Republic.