| Duerna | |
| Name Other: | Latin: Ornia |
| Map: | Duerna.png |
| Map Size: | 280px |
| Subdivision Type1: | Country |
| Subdivision Name1: | Spain |
| Length: | 54km (34miles) |
| Source1: | Union of the streams Cabrito and Ballina |
| Source1 Location: | Pobladura de la Sierra, Lucillo, Maragatería, León, Castile and León, Spain |
| Source1 Elevation: | 1120m (3,680feet) |
| Mouth: | Tuerto river |
| Mouth Location: | Requejo de la Vega, Soto de la Vega, Tierra de La Bañeza, León, Castile and León, Spain |
| Mouth Elevation: | 775m (2,543feet) |
| Basin Size: | 317km2 |
| Tributaries Left: | Peces |
| Tributaries Right: | Espino, Llamas |
The Duerna is a river in the province of León, Spain. It begins at the convergence of the Cabrito and Ballina streams, in the town of Pobladura de la Sierra, in the Lucillo municipality.