| Samanala Dam සමනලවැව වේල්ල | |
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  Location of Samanala Dam සමනලවැව වේල්ල in Sri Lanka | |
| Country | Sri Lanka |
| Location | Balangoda |
| Coordinates | 06°40′48″N 80°47′54″E / 6.68000°N 80.79833°E |
| Purpose | Power |
| Status | Operational |
| Construction began | 1986 |
| Opening date | 1992 |
| Construction cost | ¥74,313 million |
| Dam and spillways | |
| Type of dam | Embankment dam |
| Impounds | Walawe River |
| Height (foundation) | 110 m (361 ft) |
| Length | 530 m (1,739 ft) |
| Spillway capacity | 3,600 m3/s (130,000 cu ft/s) |
| Reservoir | |
| Creates | Samanala Reservoir |
| Total capacity | 218,000,000 m3 (7.7×109 cu ft) |
| Catchment area | 372 km2 (144 sq mi) |
| Coordinates | 06°35′03″N 80°48′29″E / 6.58417°N 80.80806°E |
| Operator(s) | Ceylon Electricity Board |
| Turbines | 2 × 62 MW |
| Installed capacity | 124 MW |
| Annual generation | 405 GWh |
The Samanala Dam (Sinhala: සමනලවැව වේල්ල) is a dam primarily used for hydroelectric power generation in Sri Lanka. Commissioned in 1992, the Samanalawewa Project (Samanala Reservoir Project) is the third-largest hydroelectric scheme in the country, producing 405 GWh of energy annually. It was built with financial support from Japan and the United Kingdom. It is notable for a large leak on its right bank. Power production continues as planned despite the leakage, and the water from the leak now provides two thirds of the water issued by the reservoir for agriculture in downstream areas.