The Mission sui iuris of Saint Helena, Ascension and Tristan da Cunha (Latin: Missio sui iuris Sanctae Helenae, Ascensionis et Tristanensis) is part of the worldwide Catholic Church, under the spiritual leadership of the Pope in Rome. The Mission sui iuris is located in Saint Helena, Ascension and Tristan da Cunha and covering the Islands Saint Helena, Ascension and Tristan da Cunha.