The Diocese of Montemarano (Latin: Dioecesis Montis Marani) was a Roman Catholic diocese located in the town of Montemarano in the province of Avellino in the Campania region of southern Italy. It was erected in 1059, and was a member of the ecclesiastical province of Benevento. In 1818, the diocese was suppressed, and its territory and Catholic population was assigned to the Diocese of Nusco. The diocese of Nusco has been absorbed, since 30 September 1986, into the agglomerate Archdiocese of Sant'Angelo dei Lombardi-Conza-Nusco-Bisaccia.
The diocese of Montemarano was nominally restored as a titular bishopric in 1968, which were needed with the increase in the number of auxiliary bishops, vicars apostolic, papal nuncios, and Vatican bureaucrats who needed nominal episcopal status.
The following bishops have held or hold the title; 'Archbishop' is a personal title, granted to a nuncio to give him status, but he is still 'titular bishop':
Bishop Alejo del Carmen Obelar Colman, Benedictine Order (S.D.B.) (1969.03.06 – 1989.12.30)
Archbishop Salvatore Pennacchio (1998.11.28 – ...), Apostolic Nuncio (papal ambassador) to India and Nepal.
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