Hugh Fenn (died 1409), also written Fenne or atte Fenn, was an English businessman from Great Yarmouth in Norfolk who was active in local and national government during the reigns of Kings Richard II and Henry IV. It was a ship he part-owned which in 1406 captured the future King James I of Scotland.
Born about 1355, the son of Peter Fenn,bailiff of Yarmouth in 1360, and related to John Fenn, three times bailiff between 1368 and 1378, he became a prominent merchant in the town and was elected to various offices in its administration, serving nine terms as bailiff from 1383 on. By 1386 he was a member of the Guild of St George, which united the most important citizens of the town.
By royal appointment, he was appointed controller of customs in 1391, collector of customs between from 1392, and a justice of the peace from 1398. In three Parliaments, those of 1395, January 1397, and 1399, he represented the borough in the House of Commons. In 1397 he was appointed Deputy Butler of England, serving under three Chief Butlers in succession, the last being Sir Thomas Chaucer. From 1398, he sat on various royal commissions to do with trade and shipping.
On his own account and in partnerships he traded in substantial quantities of fish, wine, cloth, salt and grain, owning or part-owning a number of ships that sailed in the North Sea, the Baltic and down to the English-controlled port of Bordeaux. Among many local people of influence with whom he was involved financially were Sir John Fastolf, father of the illustrious Sir John Fastolf, and the MP and sheriff of Norfolk and Suffolk, Ralph Ramsey. In March 1404 he was appointed Mayor of the Staple, controlling all wool and leather exports from East Anglia.