| Fehntjer Tief | |
| Mouth Location: | Oldersumer Sieltief |
| Mouth Coordinates: | 53.347°N 7.3442°W |
| Progression: | → |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Lower Saxony |
Fehntjer Tief is a river in East Frisia, Lower Saxony, Germany. It discharges into the Ems through the near Emden.