| Grössinsee | |
| Image Bathymetry: | Nuthe_Nieplitz_Seen_Kern.jpg |
| Location: | Brandenburg |
| Pushpin Map: | Brandenburg |
| Coords: | 52.25°N 13.1333°W |
| Inflow: | Nieplitz |
| Outflow: | Nieplitz |
| Basin Countries: | Germany |
| Length: | 1.85km (01.15miles) |
| Width: | 0.75km (00.47miles) |
| Area: | 0.94km2 |
| Max-Depth: | 3m (10feet) |
| Elevation: | 33.2m (108.9feet) |
Grössinsee is a lake in Brandenburg, Germany. At an elevation of 33.2 m, its surface area is 0.94 km². It is located in the town of Trebbin, Teltow-Fläming district.