| Sasu | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Hunedoara County |
| Length: | 10km (10miles) |
| Source1: | Șureanu Mountains |
| Mouth: | Strei |
| Mouth Coordinates: | 45.5633°N 23.3427°W |
| Basin Size: | 17km2 |
The Sasu is a river in the Șureanu Mountains, north of Petroșani, Romania. It is a left tributary of the Strei. Its length is 10km (10miles) and its basin size is 17km2.