William Paulet, 1st Marquess of Winchester (c. 1483–1572), was an English nobleman and politician during the Tudor period. He served as a key figure in the court of Henry VIII and later in the reign of Elizabeth I. Paulet held various important positions, including Lord Treasurer, and was known for his loyalty to the crown. Paulet was also a significant landowner, acquiring extensive estates through marriage and service to the monarchy. His influence extended to the management of royal finances and the administration of government, making him a prominent figure in the political landscape of 16th-century England.