Beinn Lair is a Corbett of 859 m in Highland. It sits below A' Mhaighdean, only 3.1 km to the north-east and 106.8 m higher.
It shares its height of 859 m with Caisteal Abhail and Crinkle Crags – Long Top. On the Corbetts height ladder it sits between Caisteal Abhail (859 m) and Carn Dearg Mor (857.4 m). The higher hill nearest to it, A' Mhaighdean, is a Munro, 3.1 km to the north-east.