| Ballinlough | |
| Native Name: | Irish: Baile an Locha |
| Native Name Lang: | ga |
| Settlement Type: | Village |
| Pushpin Map: | Ireland |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Ireland |
| Subdivision Type: | Country |
| Subdivision Name: | Ireland |
| Subdivision Type1: | Province |
| Subdivision Name1: | Connacht |
| Subdivision Type3: | County |
| Subdivision Name3: | County Roscommon |
| Unit Pref: | Metric |
| Population Footnotes: | [1] |
| Population: | 300 |
| Population As Of: | 2016 |
| Population Density Km2: | auto |
| Utc Offset1: | +0 |
| Timezone1 Dst: | IST (WEST) |
| Utc Offset1 Dst: | -1 |
| Coordinates: | 53.7417°N -8.6336°W |
| Blank Name: | Irish Grid Reference |
Ballinlough (;)[2] is a village in western County Roscommon, Ireland. The N60 national secondary road passes through it. The village is between Ballyhaunis and Castlerea on the Roscommon to Castlebar road. As of the 2016 census, Ballinlough had a population of 300 people.[1]
Lake O'Flynn, which lies north of the village, is notable for brown trout fishing.[3] The lake is also the source of the River Suck (which is a tributary of the River Shannon). In 2013, a bog walk was constructed around Lake O'Flynn, together with an outdoor gym.