| Type: | commune |
| County: | Buzău |
| Population Total: | auto |
| Subdivisions: | Budișteni, Costești, Gomoești, Groșani, Pietrosu, Spătaru |
| Costești | |
| Leader Name: | Nicolae Gioabă[1] |
| Leader Party: | PSD |
| Leader Term: | 2020 - 2024 |
| Coordinates: | 45.05°N 72°W |
| Postal Code: | 127200-127206 |
Costești (in Romanian; Moldavian; Moldovan pronounced as /kosˈteʃtʲ/) is a commune in the Buzău County, Muntenia, Romania. It is composed of six villages: Budișteni, Costești, Gomoești, Groșani, Pietrosu, and Spătaru.