The Diocese of Ostrava-Opava () is a suffragan Latin diocese in the ecclesiastical province of the Archdiocese of Olomouc in Moravskoslezský kraj, Moravia, in the Czech Republic.
The cathedral episcopal see is Katedrála Boà ¾ského Spasitele, dedicated to the Divine Saviour, in Ostrava, and it also has
As per 2014, it pastorally served 429,300 Catholics (32.7% of 1,314,000 total) on 6,150 kmò in 276 parishes and a mission with 247 priests (188 diocesan, 59 religious), 30 deacons, 218 lay religious (76 brothers, 142 sisters) and 8 seminarians.
(all Roman rite)