Llyn Celyn
| Dam Name | Llyn Celyn |
| River | Tryweryn |
| Near City | Bala |
| Administration City | Wales |
| Country | United Kingdom |
| Year | 1965 |
| Dam Height | 58 |
| Dam Length | 701 |
| Area(Sqkm) | 3.1 |
| Area(Polygonal) | 3.1 |
| Capital Expenditure | 81 |
| Depth(M) | 26.1 |
| Avg Displacement Of Water | 1916 |
| Catchment Area In Sqkm | 59 |
| Main Usage | Water supply |
| Status | 3: Fair |
| Longitude | -3.674583 |
| Latitude | 52.94875 |
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