Powerscourt Waterfall is a waterfall near Enniskerry, County Wicklow, in Ireland, located in a valley surrounded by Djouce Mountain and the Great Sugar Loaf. At a height of 121 metres (397 ft), it is the highest waterfall on the island.
The waterfall and surrounding valley are owned by the Powerscourt Estate. In August 1821, during the visit of King George IV to Ireland, Richard Wingfield, 5th Viscount Powerscourt decided to dam the waterfall, so that he could release a torrent while the two stood on the bridge below the falls. The king was unable to leave a banquet at Powerscourt House; however when the water was finally released, the bridge was washed away.