Sir William Hardres, 4th Baronet (25 July 1686 – 7 July 1736) of Hardres Court, Upper Hardres, Kent was a British landowner and Tory politician who sat in the House of Commons in two periods between 1711 and 1735. Hardres was the son of Sir Thomas Hardres, 3rd Baronet and his wife Ursula Rooke, daughter of Sir William Rooke of Horton, Kent. He inherited the baronetcy on the death of his father on 23 February 1688. He was described as a person of great and ready wit, and in comfortable circumstances as 'a single gentleman with a £1,000 p.a. estate', and was seen as a man of great potential.