| Arpaș | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Sibiu County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Arpașu de Sus, Arpașu de Jos |
| Length: | 25km (16miles) |
| Discharge1 Location: | Mouth |
| Discharge1 Avg: | 2.13m3/s |
| Source1: | Făgăraș Mountains |
| Mouth: | Olt |
| Mouth Location: | Arpașu de Jos |
| Mouth Coordinates: | 45.7877°N 24.6193°W |
| Basin Size: | 82km2 |
| Tributaries Left: | Albota, Plăvaia, Arpășel |
| Tributaries Right: | Podragu |
The Arpaș (Hungarian: Árpás-patak) is a left tributary of the river Olt in Romania. It discharges into the Olt in Arpașu de Jos.[1] The source of the Arpaș is in the Făgăraș Mountains. Its length is 25km (16miles) and its basin size is 82km2.
The Hungarian name means "barley". The Romanian name derives from that.