| Długa | |
| Mouth Location: | Żerański Canal |
| Mouth Coordinates: | 52.3564°N 21.0339°W |
| Progression: | Żerański Canal→ |
| Subdivision Type1: | Country |
Długa is a river of Poland, which flows into the Żerański Canal north of Warsaw.
In Polish, the name of the river can be literally translated as "long".