Atri Cathedral (Italian: Basilica concattedrale di Santa Maria Assunta; Duomo di Atri) is a Romanesque Roman Catholic cathedral dedicated to the Assumption of the Virgin Mary in the town of Atri, Province of Teramo, region of Abruzzo, Italy.It was formerly, from 1251, the episcopal seat of the Diocese of Atri (later Penni-Atri) and has been since 1986 a co-cathedral of the Diocese of Teramo-Atri.