Sir John Ratcliffe or Radcliffe (22 February 1582 – 5 November 1627) was an English soldier and politician who sat in the House of Commons between 1614 and 1626. He was killed in action in France during the Siege of Saint-Martin-de-Ré. From 1606 to 1610 he travelled in France and the Low Countries, and from that period until 1615 he also served as a captain with the Dutch army. During truces he went home to do legal business and he invested in the Virginia Company.