Lough Barra (Irish: Loch Beara)[4] is a freshwater lake in the northwest of Ireland.

It is located in north County Donegal in the valley along the Gweebarra fault.

Lough Barra is about 30 kilometres (19 mi) west of Letterkenny, just outside the southwest corner of Glenveagh National Park.

[5] Fish species in Lough Barra include brown trout, salmon and the critically endangered European eel.

[3] Lough Barra is part of the Cloghernagore Bog and Glenveagh National Park Special Area of Conservation, which also includes Lough Beagh.