Beinn a' Chaisteil is a Corbett of 885.2 m in Argyll and Bute, Perth and Kinross. On the Corbetts height ladder it sits between Buidhe Bheinn (885.5 m) and Stob Dubh (884.2 m).
The higher hill nearest to it, Beinn Dorain, is a Munro, 2.6 km to the north-west.