Sir Thomas Rempston II (or Rampston) (bef. 1392 – 15 October 1458) was a medieval English soldier, landowner, and a leading military commander during the Hundred Years' War in France. He dedicated his career, as his father had done before him, to the service of the House of Lancaster, the ruling dynasty of England. Much of the Rempston family's fortunes were in fact owed to this. However, several ransoms contracted by Sir Thomas while campaigning in France, coupled with the fact that his long-living mother held many of his estates in dower, meant that he had to endure several financial difficulties for much of his life.