The former Italian Catholic Diocese of Sant'Angelo dei Lombardi-Bisaccia, in the Province of Avellino, Southern Italy, existed until 1921. In that year it was united into the Archdiocese of Conza-Campagna, to form the Archdiocese of Conza-Sant'Angelo dei Lombardi-Bisaccia.
The Diocese of Sant' Angelo de' Lombardi was created under Pope Gregory VII, but its first known bishop is Thomas, in 1179, when the see was a suffragan of the archdiocese of Conza. In 1540 under the episcopate of Rinaldo de' Cancellieri, it was united to the Diocese of Bisaccia (the ancient Romulea); it appears first as a bishopric in 1179. Another of its prelates, Ignazio Cianti, O.P. (1646), was distinguished for his learning. In 1664 the see was almost completely destroyed.
In 1818 it was incorporated with the See of Monteverde, the earliest known bishop of which is Mario (1049), and which in 1531 was united to the Archdiocese of Canne and Nazareth, from which it was later separated.
Erected: 12th Century
Latin Name: Sancti Angeli de Lombardis
United: 23 December 1517 with the Diocese of Bisaccia
Latin Name: Sancti Angeli de Lombardis et Bisaciensis
Metropolitan: Archdiocese of Conza
Territory Added: 1818 from the suppressed Diocese of Monteverde
30 September 1921: United with the Archdiocese of Conza e Campagna to form the Archdiocese of Conza-Sant'Angelo dei Lombardi-Bisaccia