Arduin the Lombard (or Arduin of Melfi) was a Greek-speaking Lombard nobleman who fought originally for the Byzantines on Sicily and later against them as the leader of a band of Norman mercenaries. He was the leader of the troops committed by Guaimar IV of Salerno to George Maniakes' Sicilian expedition in 1038. According to Amatus of Montecassino, he refused to surrender a captured horse to the Byzantine general and Maniakes consequently had him stripped and beaten. Whatever happened, Arduin and his Salernitan contingent along with the Normans (also sent by Guaimar) and the Varangians (sent by Emperor Constantine IX) abandoned Sicily and returned to the mainland.