Trevanion is an English surname. Notable people with the surname include:
Ada Trevanion, 19th century British poet and author Charles Trevanion, 17th century English politician Charles Trevanion (1631–1703), 17th century English politician Christina Trevanion (born 1981), British auctioneer and television personality John Trevanion (disambiguation), multiple people William Trevanion, 18th century British politician