| Mamu | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Vâlcea, Olt |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Fumureni, Lungești, Strejești |
| Length: | 35km (22miles) |
| Mouth: | Olt through Oporelu Canal |
| Mouth Coordinates: | 44.5077°N 24.2912°W |
| Progression: | Oporelu Canal→ |
| Basin Size: | 107km2 |
| Tributaries Left: | Silea |
| Tributaries Right: | Cernișor |
The Mamu is a tributary of the river Olt in Romania. It joins the Olt through the Oporelu Canal, into which it flows in Colibași.[1] Its length is 35km (22miles) and its basin size is 107km2.