| Kalajärvi Reservoir | |
| Coords: | 63.05°N 25.322°W |
| Type: | Reservoir |
| Pushpin Map: | Finland |
| Catchment: | Lapuanjoki |
| Basin Countries: | Finland |
| Date-Built: | 1977 |
| Area: | 11.038km2 |
| Shore: | 43.36km (26.94miles) |
| Elevation: | 105.5m (346.1feet) |
| Cities: | Seinäjoki |
Kalajärvi Reservoir (Finnish: Kalajärven tekojärvi) is a medium-sized lake of Finland. It is located in the city of Seinäjoki in Southern Ostrobothnia.[1] The reservoir was built on the site of a smaller lake, and finished in 1977.