Saint Alferius (Italian: Sant'Alferio) (930–1050) was an Italian abbot and saint.
After spending many years as a layman in civil service, in 1002 he was named the head of a delegation from his city to speak with King Robert II of France.
Taking ill during the journey, he convalesced at a monastery and vowed to become a monk himself if he recovered.
When he did, he became a Benedictine.
He subsequently founded the monastery of La Trinità della Cava, located at Cava de' Tirreni.