Roman Catholic Diocese of Barbastro-Monzón

The Diocese of Barbastro-Monzón (Latin: Dioecesis Barbastrensis-Montisonensis) is a Latin diocese of the Catholic Church located in north-eastern Spain, in the province of Huesca, part of the autonomous community of Aragón. The diocese forms part of the ecclesiastical province of Zaragoza (province), and is thus suffragan to the Archdiocese of Zaragoza.

The city of Barbastro is at the junction of the rivers Cinca and Vero. The diocese is bounded on the north by the Pyrenees, on the east and south by the Diocese of Lerida (Spanish: Lérida), and on the west by those of Huesca and Jaca.

The cathedral, the episcopal palace, the seminary, and the college of the Clerks Regular of the Pious Schools, or Piarists, are among the most noted buildings in Barbastro.

Besides the seminary for the education of young ecclesiastics, there are various communities in the diocese devoted to a contemplative life and the education of the young, including: the Piarists, the Sons of the Immaculate Heart of Mary, the Poor Clares, and the Capuchin nuns have foundations in the capital, the Benedictines in the town of Pueyo, and the Discalced Carmelites in Graus and Salas Altas. There are schools in all the towns of the diocese.