| Country: | Sri Lanka |
| Coordinates: | 7.0608°N 80.5972°W |
| Direction: | East - West |
| Start: | Kotmale |
| Finish: | Biyagama |
| Owner: | CEB |
| Operator: | CEB |
| Est: | 1979 |
| Type: | Overhead transmission line |
| Current Type: | HVAC |
| Length: | 66 |
| Length Mi: | 41 |
| Ac Voltage: | 220 kV |
| Circuits No: | 4 |
Kotmale Biyagama transmission line is one of Sri Lanka's critical transmission lines that connects the load center Colombo to hydroelectricity generation of Mahaweli Complex.[1]