Beinn Narnain (sometimes anglicised as Ben Narnain) is a mountain in the southern Highlands of Scotland, near Arrochar. It forms part of a group of hills known (unofficially) as the Arrochar Alps, and is a Munro. The name Beinn Narnain means "hill of notches", and describes the mountain's notched profile. Beinn Narnain's northern ridge drops down to the Bealach a' Mhàim, a three-sided bealach with other ridges leading to The Cobbler and Beinn Ìme. An ascent of Beinn may thus easily be extended to give a longer day on the Arrochar Alps.