| Kotmale Dam | |
| Location Map: | Sri Lanka |
| Location Map Size: | 280px |
| Coordinates: | 7.0608°N 80.5972°W |
| Country: | Sri Lanka |
| Location: | Kotmale |
| Purpose: | P |
| Status: | O |
| Owner: | Mahaweli Authority |
| Dam Type: | E |
| Dam Crosses: | Kotmale Oya |
| Dam Length: | 6000NaN0 |
| Dam Height Foundation: | 870NaN0 |
| Spillway Count: | 3 |
| Res Name: | Gamini Dissanayake Reservoir |
| Plant Name: | Kotmale Power Station |
| Plant Coordinates: | 7.1281°N 80.5783°W |
| Plant Operator: | Ceylon Electricity Board |
| Plant Turbines: | 3 × 67 MW |
| Plant Capacity: | 201 MW |
The Kotmale Dam is a large hydroelectric and irrigation dam in Kotmale, Sri Lanka. The dam generates power from three turbines, with a total installed capacity to, making it the second largest hydroelectric power station in Sri Lanka. Construction on the dam began in August 1979 and was ceremonially completed in February 1985.[1] The dam forms the Kotmale Reservoir, which was renamed to Gamini Dissanayake Reservoir on 11 April 2003 following a request by Prime Minister Ranil Wickramasinghe.[2] [3]