| Type: | commune |
| County: | Vrancea |
| Andreiașu de Jos | |
| Leader Name: | Vasilică Cristian |
| Leader Party: | PSD |
| Leader Term: | 2020 - 2024 |
| Coordinates: | 45.75°N 76°W |
| Elevation: | 493 |
| Area Total: | 103.08 |
| Population Total: | auto |
| Postal Code: | 627005 |
| Area Code: | +40 x37 |
Andreiașu de Jos is a commune located in Vrancea County, Muntenia, Romania. It is composed of seven villages: Andreiașu de Jos, Andreiașu de Sus, Arșița, Fetig, Hotaru, Răchitașu, and Titila.
The commune is located in a hilly area, at the foot of the Curvature Carpathians, on the left bank of the Milcov River, the traditional boundary between Wallachia and Moldavia.