Fan Fawr is a Hewitt of 734 m in Powys. It sits below Pen y Fan, only 4.8 km to the north-east and 152 m higher.
It shares its height of 734 m with Craig Cwm Silyn, Rhobell Fawr and Long Side. On the Hewitts height ladder it sits between Craig Cwm Silyn (734 m) and Long Side (734 m). Its nearest higher summit, Craig Gwaun Taf (826.4 m, 3.8 km east), is a listed top not profiled here.