Loch Druidibeag is a freshwater loch situated on the island of South Uist, in the Outer Hebrides of Scotland. The loch is near the northern end of the island, to the north-east of Howmore and to the east of the A865 road and south of the B890.

Howmore lies on the island of South Uist to the southwest of Loch Druidibeg. The mountain of Haarsal rises to 139 m (456 ft) to the east and immediately south is the smaller settlement of Howbeg. Howmore is also within the parish of South Uist.