| Cupaș | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Harghita, Neamț |
| Length: | 7km (04miles) |
| Source1: | Hășmaș Mountains |
| Mouth: | Bicaz |
| Mouth Coordinates: | 46.8052°N 25.8069°W |
| Basin Size: | 13km2 |
The Cupaș is a left tributary of the river Bicaz in Romania. The lower reach of the river defines the border between Harghita and Neamț counties. Its length is 7km (04miles) and its basin size is 13km2. It discharges into the Bicaz in the Bicaz Gorge, near the village Lacu Roșu.[1]