| Lisnău | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Covasna County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Lisnău-Vale, Lisnău |
| Length: | 11km (07miles) |
| Mouth: | Râul Negru |
| Mouth Coordinates: | 45.7655°N 25.8395°W |
| Basin Size: | 23km2 |
The Lisnău is a left tributary of the Râul Negru in Romania. It flows into the Râul Negru near Lunca Ozunului. Its length is 11km (07miles) and its basin size is 23km2.