The Roman Catholic Diocese of Ostrava-Opava is a diocese located in the eastern part of the Czech Republic. Established in 1996, it serves as a spiritual and administrative region for the Catholic Church, overseeing various parishes and communities within its boundaries. The diocese is part of the larger ecclesiastical province of Olomouc. The diocese's seat is in the city of Ostrava, where the main cathedral, Cathedral of the Divine Saviour, is situated. It plays a vital role in promoting the Catholic faith, providing pastoral care, and supporting various social and educational initiatives in the region.