| Neffelsee | |
| Location: | Zülpich, North Rhine-Westphalia |
| Pushpin Map: | North Rhine-Westphalia |
| Coords: | 50.6972°N 6.6253°W |
| Inflow: | Neffelbach |
| Outflow: | Neffelbach |
| Basin Countries: | Germany |
| Area: | 65ha |
| Max-Depth: | 28m (92feet) |
Neffelsee (also Naturschutzsee Füssenich) is a lake in Zülpich, North Rhine-Westphalia, Germany. With a depth of 28 m, its surface area is 65 ha.