| Jurisdiction: | Diocese |
| Ostrava-Opava | |
| Latin: | Dioecesis Ostraviensis-Opaviensis |
| Local: | Diecéze ostravsko-opavská |
| Country: | Czech Republic |
| Metropolitan: | Olomouc |
| Rite: | Latin Rite |
| Cathedral: | Cathedral of the Divine Saviour |
| Cocathedral: | Co-Cathedral of the Assumption of the Virgin Mary, Opava |
| Patron: | St. Hedwig of Silesia |
| Area Km2: | 6360 |
| Population: | 1,292,170 |
| Population As Of: | 2016 |
| Catholics: | 429,000 |
| Catholics Percent: | 33.2 |
| Bishop: | Martin David |
| Map: | Rep Ceca - Diocesi di Ostrava-Opava.png |
| Denomination: | Catholic Church |
The Diocese of Ostrava-Opava (Latin: Ostraviensis-Opaviensis) 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 Božského 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 km² 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)