The Diocese of Tortosa is a Latin church diocese of the Catholic Church covering the south of Catalonia and the north of the Valencian Community. It is a suffragan diocese of the Archdiocese of Tarragona.

The Archdiocese of Tarragona is a Latin Church ecclesiastical territory located in north-eastern Spain, in the province of Tarragona, part of the autonomous community of Catalonia. The archdiocese heads the ecclesiastical province of Tarragona, having Metropolitan authority over the suffragan dioceses of Girona, Lleida, Solsona, Tortosa, Urgell and Vic.