| Cerna | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Tulcea County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Cerna, Traian |
| Mouth: | Danube |
| Mouth Location: | Lake Traian |
| Mouth Coordinates: | 45.0323°N 28.2234°W |
| Progression: | Lake Traian→ |
| Tributaries Left: | Iaila |
| Tributaries Right: | Megina |
The Cerna is a small right tributary of the Danube in Romania. It flows into Lake Traian, which is connected with the Danube, in the village Traian.[1]