| Tietzowsee | |
| Location: | Rheinsberg Lake Region, Brandenburg |
| Pushpin Map: | Brandenburg |
| Coords: | 53.1679°N 12.8763°W |
| Outflow: | Jagowkanal |
| Basin Countries: | Germany |
| Area: | 44ha |
| Max-Depth: | 8m (26feet) |
The Tietzowsee is a lake in the Rheinsberg Lake Region in the German state of Brandenburg. It covers and area of 44ha within the municipality of Rheinsberg.