Aonach Beag is a 1,116-metre (3,661 ft) mountain in the Highlands of Scotland in the remote area between Loch Ericht and Loch Laggan located about 4 kilometres (2.5 mi) northwest of Ben Alder.

Its prominence is 99 metres (325 ft) with its parent peak, Geal-Charn, about 1 kilometre (0.62 mi) to the east.

[2] It should not be confused with the better-known Munro near Ben Nevis, also called Aonach Beag, about 30 kilometres (19 mi) to the west.

Its neighbouring peak to the west is Beinn Eibhinn which extends over a larger area although at 1,100 metres (3,600 ft) it is slightly less high.

The shortest route of ascent starts from Corrour railway station and passes Loch Ossian youth hostal before going beside the southern shore of Loch Ossian to pass Corrour Lodge and then go up Bealach Dubh along Uisge Labhair.