| Konnivesi | |
| Pushpin Map: | Finland |
| Coords: | 61.1667°N 35°W |
| Catchment: | Kymijoki |
| Basin Countries: | Finland |
| Area: | 49.596km2 |
| Shore: | 319.88km (198.76miles) |
| Elevation: | 77.4m (253.9feet) |
| Frozen: | December–April |
| Islands: | Konnisaari, Vähäsaari |
| Cities: | Heinola, Iitti |
Konnivesi is a medium-sized lake of Finland in the Kymijoki main catchment area. It is located partly in region Päijänne Tavastia, near the town Heinola, partly in region Kymenlaakso. There is a waterway crossing the Heinola town and connecting the lake to another lake Ruotsalainen.[1]