John of Salerno () may refer to John I of Salerno (died 1007), prince of Salerno (981–983) and duke of Amalfi (1004–1007) John II of Salerno (died 994), prince of Salerno (983–994) John III of Salerno (1317-1388), Augustinian friar, disciple of Simone Fidati da Cascia, and close to Angelo Clareno John of Ajello or John of Salerno (died 1169), Bishop of Catania (1167–1169) John of Salerno (cardinal), diplomat and Cardinal-priest of Santo Stefano al Monte Celio (1190–1208) (1190–1242), monk beatified in 1783