| Iauna | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Caraș-Severin County |
| Length: | 7km (04miles) |
| Mouth: | Cerna |
| Mouth Coordinates: | 45.059°N 22.601°W |
| Basin Size: | 23km2 |
The Iauna is a right tributary of the river Cerna in Romania. It discharges into the Cerna near Țațu. Its length is 7km (04miles) and its basin size is 23km2.