| Official Name: | Ballylough |
| Static Image Name: | Ballylough private fishing lough - geograph.org.uk - 740923.jpg |
| Static Image Caption: | Ballylough private fishing lough |
| Map Type: | Northern Ireland |
| Coordinates: | 54.267°N -5.933°W |
| Label Position: | none |
| Unitary Northern Ireland: | Down |
| Lieutenancy Northern Ireland: | County Down |
| Constituency Westminster: | South Down |
| Constituency Ni Assembly: | South Down |
| Country: | Northern Ireland |
| Hide Services: | yes |
Ballylough (Baile-an-locha; "the townland of the lake")[1] is a small village and townland in County Down, Northern Ireland. It lies roughly north of Newcastle and just east of Castlewellan and northeast of Annsborough.
It is situated beside Ballylough Lake, popular for fishing for rainbow trout and run by Castlewellan and Annsborough Angling Club.[2]