Vâlcănești is a commune in Prahova County, Muntenia, Romania. It is composed of three villages: Cârjari, Trestioara, and Vâlcănești.

The commune lies on the banks on the river Cosmina, in the foothills of the Sub Carpathians. It is located in the central part of the county, 27 km (17 mi) north of the county seat, Ploiești.

At the 2011 census, Vâlcănești had 3,502 residents; of those, 91.03% were ethnic Romanians and 6.25% were Roma.