Thorisvatn Reservoir
| Reservoir Name | Thorisvatn |
| Dam Name | Thorisos |
| River | Thorisos |
| Near City | Selfoss |
| Administration City | Rangarvallasysla |
| Country | Iceland |
| Year | 1972 |
| Dam Height | 33 |
| Dam Length | 1125 |
| Area(Sqkm) | 66.4 |
| Area(Polygonal) | 66.4 |
| Capital Expenditure | 1180 |
| Depth(M) | 17.8 |
| Avg Displacement Of Water | 8138 |
| Catchment Area In Sqkm | 280 |
| Main Usage | Hydroelectricity |
| Multi Dams,C,10 | Yes |
| Status | 3: Fair |
| Longitude | -18.815417 |
| Latitude | 64.327083 |
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