| Plai | |
| Name Other: | Laposnyak-patak, Lăpușnic |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Hunedoara County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Stâncești, Rădulești, Lăpușnic |
| Length: | 13km (08miles) |
| Source1: | Poiana Ruscă Mountains |
| Mouth: | Mureș |
| Mouth Location: | Lăpușnic |
| Mouth Coordinates: | 45.9285°N 22.6203°W |
| Basin Size: | 26km2 |
The Plai (also: Lăpușnic, Hungarian: Laposnyak-patak) is a left tributary of the river Mureș in Romania. It discharges into the Mureș in Lăpușnic. Its length is 13km (08miles) and its basin size is 26km2.