Thomas Gewen (1585 – November 1660) was an English politician who sat in the House of Commons variously between 1645 and 1660. He was the grandson of Thomas and the son of Christopher Gewen of Werrington. He was educated at the Queen's College, Oxford and the Inner Temple. He married twice; first to a daughter of Edward Cosworth, with whom he had a son. In July 1622, he married Mary, the daughter of Matthew Springham, with whom he had one son and two daughters. He was Recorder of Launceston, and as Justice of the Peace was responsible for conducting marriages.