Sir Watkin Williams-Wynn, 4th Baronet (23 September 1749 – 24 July 1789) was a Welsh landowner, politician and patron of the arts. The Williams-Wynn baronets had been begun in 1688 by the politician Sir William Williams, 1st Baronet, but had inherited, in the time of the 3rd baronet, Sir Watkin's father, the estates of the Wynn baronets, and changed their name to reflect this.