John St Aubyn (1613–1684) was an English politician who sat in the House of Commons of England in 1640. He served as a colonel in the parliamentary army in the English Civil War. St Aubyn was the eldest son of John St. Aubyn of Clowance, Cornwall and his wife Catherine Arundell, daughter of John Arundell of Trerice. He entered Middle Temple in 1631. In April 1640, St Aubyn was elected Member of Parliament for Tregoney. He became commissioner for assessment for Cornwall, commissioner for sequestrations and commissioner for levying of money in 1643. In 1644 for was commissioner for execution of ordinances and became High Sheriff of Cornwall to 1645. He became recorder of St Ives in 1646.