Sir Watkin Williams-Wynn, 3rd Baronet (c. 1692 – 26 September 1749) was a Welsh politician and landowner who sat in the British House of Commons from 1716 to 1749, when he died in office. A member of the Tory party, he was also a prominent Jacobite sympathiser. He helped engineer the downfall of Prime Minister Robert Walpole in 1742 and engaged in negotiations with the exiled Stuarts prior to the Jacobite rising of 1745 but did not participate in the rebellion himself. Watkin died in a hunting accident in 1749.