| Arcuș | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Covasna County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Arcuș |
| Length: | 14km (09miles) |
| Mouth: | Olt |
| Mouth Coordinates: | 45.881°N 25.813°W |
| Basin Size: | 29km2 |
| Tributaries Left: | Valea Umbrei, Valea Răpoasă |
| Tributaries Right: | Șugaș |
The Arcuș (Hungarian: Árkos-patak) is a right tributary of the river Olt in Romania. It discharges into the Olt near the city Sfântu Gheorghe.[1] Its length is 14km (09miles) and its basin size is 29km2.