| Type: | commune |
| County: | Galați |
| Costache Negri | |
| Leader Name: | Luca Ștefan |
| Leader Party: | PSD |
| Leader Term: | 2020 - 2024 |
| Coordinates: | 45.7°N 70°W |
| Elevation: | 49 |
| Area Total: | 26.8 |
| Population Total: | auto |
| Postal Code: | 807095 |
Costache Negri is a commune in Galați County, Western Moldavia, Romania with a population of 2,562 people. It is composed of a single village, Costache Negri, and is named after Costache Negri, an 1848 revolutionary, who had an estate in the village, which was previously named Mânjina.[1]
The commune lies on the banks of the river Geru, at the southern edge of the Moldavian Plateau. It is located in the central part of the county, on county road DJ251, at a distance of from Tecuci and from the county seat, Galați.