| Leșu | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Bistrița-Năsăud County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Lunca Leșului, Leșu |
| Length: | 27km (17miles) |
| Mouth: | Ilva |
| Mouth Coordinates: | 47.3173°N 24.6961°W |
| Progression: | Ilva→ |
| Basin Size: | 136km2 |
| Tributaries Left: | Erboasa |
The Leșu is a left tributary of the river Ilva in Romania. It discharges into the Ilva near the village Leșu.[1] Its length is 27km (17miles) and its basin size is 136km2.