| Type: | commune |
| County: | Bacău |
| Population Total: | auto |
| Oncești | |
| Coordinates: | 46.479°N 27.2595°W |
Oncești is a commune in Bacău County, Western Moldavia, Romania. It is composed of seven villages: Bărboasa, Dealu Perjului, Oncești, Onceștii Vechi, Satu Nou, Tarnița and Taula.