Loch Lubnaig is a small loch near Callander in the Stirling council area, Scotland. It lies in the former county of Perthshire. It is around 5 km long, and has depths of up to 44.5 metres. The loch nestles in the space between Ben Ledi and Ben Vorlich. Fed by the River Balvaig from the north and drained by the River Leny to the south, Loch Lubnaig offers fishing from the shore while canoes can be rented at the north end.