| Pieksänjärvi | |
| Location: | Pieksämäki |
| Coords: | 62.35°N 36°W |
| Type: | Lake |
| Pushpin Map: | Finland |
| Inflow: | Haapajoki |
| Catchment: | Kymijoki |
| Basin Countries: | Finland |
| Area: | 20.984km2 |
| Depth: | 2.07m (06.79feet) |
| Max-Depth: | 14m (46feet) |
| Volume: | 0.0434km3 |
| Shore: | 64.43km (40.03miles) |
| Elevation: | 118.9m (390.1feet) |
| Frozen: | December–April |
| Islands: | Salonsaari, Lastensaari, Tuomarsaari, Pajuluoto, Kirkkosaari |
| Cities: | Pieksämäki |
Pieksänjärvi is a medium-sized lake in Pieksämäki, Southern Savonia region in eastern Finland. It is situated in the Kymijoki main catchment area. It is located in the town of Pieksämäki.[1]