Costești is a commune located in Vâlcea County, Oltenia, Romania.

It is composed of four villages: Bistrița, Costești, Văratici, and Pietreni.

The commune is located in the central-north part of the county, in the foothills of the Southern Carpathians, some 32 km (20 mi) west of the county seat, Râmnicu Vâlcea.

Costești is traversed by national road DN67 [ro], which connects Râmnicu Vâlcea to Târgu Jiu and Drobeta-Turnu Severin further west.

Part of the Buila-Vânturarița National Park is situated on the territory of the commune.