John Trevanion (1613–1643) was an English politician who sat in the House of Commons of England from 1640 to 1643. He was a royalist officer who was killed in action in the English Civil War. Trevanion was the son of Charles Trevanion of Caerhayes in Cornwall and his wife Amia Mallet. Trevanion was a Member of Parliament, representing the Cornish boroughs of Grampound in the Short Parliament in 1640 and Lostwithiel in the Long Parliament from 1640 until his death in action at the siege of Bristol. A seventeenth-century ode relating to four Cornish commanders included the distich: