| Runc | |
| Name Other: | Idieș |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Bistrița-Năsăud County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Runcu Salvei |
| Length: | 19km (12miles) |
| Mouth: | Someșul Mare |
| Mouth Location: | Mititei |
| Mouth Coordinates: | 47.2891°N 24.3294°W |
| Basin Size: | 51km2 |
| Tributaries Left: | Valea Socilor |
The Runc or Idieș is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Mititei. Its length is 19km (12miles) and its basin size is 51km2.