Lough Arrow (Irish: Loch Arbhach)[6] is a freshwater lake in the northwest of Ireland.

It is fed mainly by springs but also by a number of streams entering on the lake's western and southern sides.

[4] Fish present in Lough Arrow include brown trout, perch, roach, three-spined stickleback, pike, rudd, bream and the critically endangered European eel.

[3] Lough Arrow has been designated a Special Area of Conservation as a hard water lake habitat.

Carrowkeel Megalithic Cemetery is located in the Bricklieve Mountains above the lake's western side.