The Diocese of Speyer is a Roman Catholic diocese located in the city of Speyer, Germany. Established in the 10th century, it has a rich history and plays a significant role in the Catholic Church in Germany. The diocese is part of the ecclesiastical province of Archdiocese of Freiburg and serves a diverse population of Catholics in the region. The diocese is known for its historic cathedral, the Speyer Cathedral, a UNESCO World Heritage site, which showcases Romanesque architecture. The bishop of Speyer oversees the spiritual and administrative needs of the diocese, which includes various parishes and institutions dedicated to education and social services.