| Mallasvesi | |
| Location: | Pälkäne, Valkeakoski |
| Coords: | 61.3°N 34°W |
| Pushpin Map: | Finland |
| Type: | Lake |
| Inflow: | Kostianvirta, Sulkusalmi |
| Outflow: | Valkeakoski rapids |
| Catchment: | Kokemäenjoki |
| Basin Countries: | Finland |
| Area: | 55.711km2 |
| Depth: | 6.84m (22.44feet) |
| Max-Depth: | 32.89m (107.91feet) |
| Volume: | 0.384km3 |
| Shore: | 159.37km (99.03miles) |
| Elevation: | 84.2m (276.2feet) |
| Frozen: | December–April |
| Islands: | Hausalo (0.94 m2), Karhunsalo (0.37 m2) |
| Cities: | Valkeakoski, Pälkäne |
Mallasvesi is a medium-sized lake in Finland. The lake is part of the Kokemäenjoki basin and it is located for municipalities of Pälkäne and Valkeakoski in the Pirkanmaa region. It is a part of a chain of lakes that begins from the lakes Lummene, Vehkajärvi and Vesijako at the drainage divide between the Kokemäenjoki and Kymijoki basins and flows westwards through lakes Kukkia, Iso-Roine, Hauhonselkä and Ilmoilanselkä.[1]