The Diocese of Jerez de la Frontera (Latin: Dioecesis Assidonensis-Ierezensis) is a Latin Church diocese of the Roman Catholic Church. Its name derives from the localities of Medina-Sidonia and Jerez de la Frontera. This bishopric was erected the 3 of March 1980 by means of a Papal Bull, with the name of Asidonense-Jerezano, in memory of the old Asidonense Bishopric and because its present seat is in Jerez de la Frontera. The main temple of this diocese the Colegiata of San Salvador, today Jerez's Cathedral. The Bishopric of the Diocese is in Palace of Bertemati, in the Seat of the Stream. Asidonia-Jerez Seminary was founded in 1985.
Juan Grande Roman has like santo pattern from the diocese and like patron to the Immaculate Conception.