Fan Brycheiniog – Twr y Fan Foel is a Hewitt of 802.5 m in Powys. All four of its nearest neighbours lie to the east, so it stands at the western edge of its group.
On the Hewitts height ladder it sits between Ben Lugmore (803 m) and The Old Man of Coniston (802.4 m). Its nearest higher summit, Craig Gwaun Taf (826.4 m, 18.1 km east), is a listed top not profiled here.