Beinn Udlamain is a Scottish mountain which stands just to the west of the summit of the Pass of Drumochter and east of Loch Ericht, some 30 km west-northwest of the village of Blair Atholl.

It is the highest of the Drumochter hills, however it is not the most eye catching of the group, being flat topped and shielded from a clear view from the A9 road by the surrounding Munros of Sgairneach Mhòr and A' Mharconaich.

Beinn Udlamain’s slopes consist mostly of grass and heather with very little rock but they do drop steeply to the west towards Loch Ericht and to the east to the valley of the Allt Coire Dhomhain.

The ski circuit of A' Mharconaich, Beinn Udlamain and Sgairneach Mhor is a classic route made popular by the close accessibility of the A9 road and the fact that the hills hold snow very well.

[5] Drainage from Beinn Udlamain goes to the east coast of Scotland either via Loch Ericht or the Allt Coire Dhomhain, both routes eventually join the River Tay.