| Lazu | |
| Name Other: | Láz-patak |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Hunedoara County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Rapolțel, Rapoltu Mare |
| Length: | 11km (07miles) |
| Mouth: | Mureș |
| Mouth Location: | Rapoltu Mare |
| Mouth Coordinates: | 45.8521°N 23.0815°W |
| Basin Size: | 19km2 |
The Lazu (Hungarian: Láz-patak) is a right tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș in Rapoltu Mare. Its length is 11km (07miles) and its basin size is 19km2. Its name originates from the Hungarian, means “Fever Creek”.