| Petrilaca | |
| Name Other: | Péterlaka-patak |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Mureș County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Petrilaca de Mureș |
| Length: | 15km (09miles) |
| Mouth: | Mureș |
| Mouth Location: | Periș |
| Mouth Coordinates: | 46.6899°N 24.6468°W |
| Basin Size: | 52km2 |
| Tributaries Left: | Iara |
The Petrilaca (Hungarian: Péterlaka-patak, meaning "Peter's Place Creek") is a left tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș near Gornești.[1] Its length is 15km (09miles) and its basin size is 52km2.