| Runcșor | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Bihor County |
| Source1 Location: | Pădurea Craiului Mountains |
| Source1 Coordinates: | 46.8311°N 22.5389°W |
| Source1 Elevation: | 725m (2,379feet) |
| Mouth Location: | Runcșor Sinkhole |
| Mouth Coordinates: | 46.8454°N 22.4932°W |
| Progression: | sinkhole→ Toplicioara→ Șoimuș→ |
The Runcșor is a river in the Valea Roșie river basin in Romania. It rises in the Pădurea Craiului Mountains and flows westwards until it disappears in the Runcșor sinkhole. Most of the discharge flows into the Toplicioara or Bulbuci karst spring, which feeds a right tributary of the Șoimuș.[1]