Beinn a' Chaolais is a Graham of 735.2 m in Argyll and Bute. It is one of only three register hills in the Jura, Scarba and Colonsay region, with Beinn an Oir and Beinn Shiantaidh.
On the Grahams height ladder it sits between Marsco (737.2 m) and Beinn na h-Eaglaise (Highland, NG908523) (735.1 m). The higher hill nearest to it, Beinn an Oir, is a Corbett, 1.8 km to the north-east. The database describes the top as a rock by cairn/shelter. It falls on two OS 1:50,000 sheets, 60 and 61.