The Roman Catholic Archdiocese of Agaña (Latin: Archidiœcesis Aganiensis, Spanish: Arquidiócesis de Agaña) is an ecclesiastical territory or diocese of the Catholic Church in the United States. It comprises the United States dependency of Guam. The prelate is an archbishop whose cathedral is the Dulce Nombre de Maria Cathedral-Basilica. The archdiocese is a member of the Episcopal Conference of the Pacific (CEPAC) and of the , and an observer to the United States Conference of Catholic Bishops.