Waun Rydd is a Hewitt of 769.2 m in Powys. It sits below Pen y Fan, only 5.1 km to the west and 116.8 m higher.
Of the 12 register hills in Powys, it has the smallest drop. Its nearest higher summit, Cribyn (793.8 m, 3.9 km west), is a listed top not profiled here. The highest point is recorded as grassy knoll, not a cairn.