The Diocese of Acerno was a Roman Catholic diocese based in Acerno, a distance of 68 km (42 mi.) from Naples in southern Italy, with the bishop's seat in Acerno Cathedral. Created in the 11th century, in 1818, the diocese was granted in perpetual administratorship to the archbishops of Salerno. In the reorganization of ecclesiastical provinces in 1986, Acerno was suppressed, to create the Archdiocese of Salerno-Campagna-Acerno.[1][2]