Sir William Pynsent, 2nd Baronet (c. 1679–1765) was a British landowner and politician who sat in the House of Commons from 1715 to 1722. He is commemorated by a tall monument at Curry Rivel, Somerset erected by William Pitt the Elder, to whom he left his entire fortune. Pynsent died on 8 January 1765, aged 85, outliving his son and three daughters who had died without issue. Horace Walpole wrote of him: "He was said to have had parts and humour, not many scruples, living to her death with his only daughter, in pretty notorious incest".