| Type: | commune |
| County: | Prahova |
| Posești | |
| Population Total: | auto |
| Leader Name: | Valentin-Gheorghe Spătărelu[1] |
| Term: | 2020 - 2024 |
| Leader Party: | PSD |
| Coordinates: | 45.2704°N 26.1479°W |
| Area Total: | 54.90 |
| Postal Code: | 107440 |
Posești is a commune in Prahova County, Muntenia, Romania. It is composed of ten villages: Bodești, Merdeala, Nucșoara de Jos, Nucșoara de Sus, Poseștii-Pământeni (the commune centre), Poseștii-Ungureni, Târlești, Valea Plopului, Valea Screzii, and Valea Stupinii.
The commune is located in the northeastern part of the county, in the Sub Carpathian hills, on the border with Buzău County. It lies from Vălenii de Munte and from the county seat, Ploiești.[2] Posești covers an area of .[3] The river Zeletin flows through the village Poseștii-Pământeni.
According to the 2011 census, Posești has 3,990 inhabitants; 95.54% of them are ethnic Romanians and 1.36% are ethnic Romani.