John V of Naples

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John V was the son and successor of Sergius IV as Duke of Naples from 1036 to 1042.

In 1036, upon succeeding his abdicating father, who entered a monastery, he allied with Guaimar IV of Salerno, who was at odds with Pandulf IV of Capua, his father's longtime enemy. He was sent by Guaimar to Constantinople to beseech the aid of the Byzantine Emperor against Pandulf. The emperor ignored his pleas.

John did homage to Guaimar and remained faithful to him throughout his reign.