Beno or Benno (fl. 1082–1098), also known as Bruno, was an imperialist Roman Catholic cardinal and priest of Santi Silvestro e Martino ai Monte during the Investiture Controversy. He was one of the bishops who abandoned Pope Gregory VII (Hildebrand) in 1084 and consecrated Antipope Clement III, the candidate of Emperor Henry IV, in Rome. He wrote the Gesta Romanae ecclesiae contra Hildebrandum, an account of the alleged misdeeds of Gregory.