Lough Golagh is a freshwater lake in the northwest of Ireland.

It is located in south County Donegal.

Lough Golagh is located about 10 kilometres (6 mi) northeast of Ballyshannon.

[1] Lough Golagh forms part of the Lough Golagh and Breesy Hill Special Area of Conservation.

An island in the lake supports important bird species including common tern and black-headed gull.