| Type: | commune |
| County: | Giurgiu |
| Population Total: | auto |
| Leader Name: | Fabian Țîrcă[1] |
| Leader Party: | PNL |
| Term: | 2020 - 2024 |
| Coordinates: | 43.95°N 27°W |
Oinacu is a commune located in Giurgiu County, Muntenia, Romania. This commune is composed of three villages: Braniștea, Comasca and Oinacu.
Comasca was part of Braniștea from 1968 to 2006.