| Fredersdorfer Mühlenfließ | |
| Mouth Location: | Spree |
| Mouth Coordinates: | 52.4385°N 13.6775°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | States |
| Subdivision Name2: | Brandenburg, Berlin |
| Length: | 32.6km (20.3miles) |
Fredersdorfer Mühlenfließ is a river of Brandenburg and Berlin, Germany. It flows into the Müggelsee, which is drained by the Spree, near Rahnsdorf.