Glen Lough (Irish: Loch an Ghleanna)[4] is a freshwater lake in the northwest of Ireland.

[5] Glen Lough is fed mainly by the Owencarrow River entering at its southern end.

The lake drains northwards into the Lackagh River, which in turn enters Sheephaven Bay.

The Owencarrow connects the lake with its southern neighbour, Lough Beagh.

[2][3] Fish species in Glen Lough include brown trout (including sea trout), Arctic char, salmon, minnow and the critically endangered European eel.