| Porumbacu | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Sibiu County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Porumbacu de Sus, Porumbacu de Jos |
| Length: | 27km (17miles) |
| Discharge1 Location: | |
| Discharge1 Avg: | 1.72m3/s |
| Source1: | Făgăraș Mountains |
| Mouth: | Olt |
| Mouth Location: | Porumbacu de Jos |
| Mouth Coordinates: | 45.7674°N 24.4373°W |
| Basin Size: | 80km2 |
| Tributaries Left: | Șerbota, Porumbăcel, Lișcov |
| Tributaries Right: | Tunsu |
The Porumbacu (in its upper course also: Valea Sărății and Valea Mare) is a left tributary of the river Olt in Romania. It discharges into the Olt in Porumbacu de Jos.[1] The Porumbacu originates on the northern slope of Negoiu Peak, Făgăraș Mountains. Its length is 27km (17miles) and its basin size is 80km2.