Knockanaffrin is a Hewitt of 755 m in Waterford. On the Hewitts height ladder it sits between Y Llethr (755.1 m) and Dale Head (754 m).
Its nearest higher summit, Carrignagower (767 m, 4.1 km south-east), is a listed top not profiled here. The highest point is recorded as rock, not a cairn.