| Căoi | |
| Name Other: | Vecel-patak |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Hunedoara County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Chergheș, Căoi, Vețel |
| Length: | 8km (05miles) |
| Mouth: | Mureș |
| Mouth Location: | Vețel |
| Mouth Coordinates: | 45.9078°N 22.799°W |
| Basin Size: | 19km2 |
The Căoi (Hungarian: Vecel-patak) is a left tributary of the river Mureș in Romania. It discharges into the Mureș in Vețel. Its length is 8km (05miles) and its basin size is 19km2.