| Pyhävesi | |
| Coords: | 61.4298°N 26.7741°W |
| Pushpin Map: | Finland |
| Catchment: | Kymijoki |
| Basin Countries: | Finland |
| Area: | 15.732km2 |
| Depth: | 7.1m (23.3feet) |
| Max-Depth: | 26.82m (87.99feet) |
| Volume: | 0.112km3 |
| Shore: | 85.23km (52.96miles) |
| Elevation: | 81.5m (267.4feet) |
| Frozen: | December–April |
| Islands: | Huuhtsaari |
| Cities: | Mäntyharju |
Pyhävesi is a medium-sized lake located in the southeast of Finland. The nearest town is Mäntyharju to the south. It belongs to Kymijoki main catchment area and to region Kymenlaakso.[1]