Llyn Brianne
| Dam Name | Llyn Brianne |
| River | Towy |
| Near City | Llandovery |
| Administration City | Wales |
| Country | United Kingdom |
| Year | 1972 |
| Dam Height | 91 |
| Dam Length | 274 |
| Area(Sqkm) | 1.8 |
| Area(Polygonal) | 1.8 |
| Capital Expenditure | 61 |
| Depth(M) | 33.9 |
| Avg Displacement Of Water | 2939 |
| Catchment Area In Sqkm | 84 |
| Main Usage | Water supply |
| Status | 3: Fair |
| Longitude | -3.76625 |
| Latitude | 52.124583 |
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