The Roman Catholic Diocese of Sandomierz is a diocese located in southeastern Poland. It was established in 1818 and is part of the larger ecclesiastical province of Lublin. The diocese serves a significant number of parishes and is responsible for the spiritual needs of its Catholic community. The diocese's cathedral, known as the Cathedral of Sandomierz, is an important historical and architectural site. It is dedicated to the Assumption of the Blessed Virgin Mary and reflects the rich religious heritage of the region. The diocese also engages in various educational and charitable activities to support its local communities.