The Brack is a mountain, located in the Arrochar Alps, on the south side of Glen Croe, near Loch Goil in Argyll and Bute in Scotland. The Brack has two summits: the lower peak, Cruach Fhiarach, can be seen from the shores of Loch Long, and the main peak is seen from Glen Croe and Loch Goil.
The Brack is in the Ardgoil range, which is located on a peninsula bounded on the west by Loch Goil and Loch Long on the east, both lochs being arms of the Firth of Clyde. The Brack is connected by ridges to Ben Donich and Cnoc Coinnich, and is surrounded by a number of higher peaks. It is classified as a Corbett.