Beinn a' Chaisteil is a Corbett of 787.2 m in Highland. It stands 156.1 m above its nearest neighbour, Meall a' Chaorainn (Highland, NH360827), 2.8 km to the north-west.
On the Corbetts height ladder it sits between Auchnafree Hill (787.4 m) and Meall Tairneachan (787 m). Its nearest higher summit, Carn Gorm-loch (908.9 m, 5.1 km west), is a listed top not profiled here. The summit is marked by a trig point.