The Valea Cerbului is a right tributary of the river Prahova in Romania. It source is in the Bucegi Mountains. It flows into the Prahova in Bușteni. Its length is 7 km (4.3 mi) and its basin size is 26 km (10 sq mi).

Tributaries

The following rivers are tributaries to the river Valea Cerbului (from source to mouth):

• Left: Pârâul Dracilor, Râpa Roșie, Fântânița, Valea Comorilor, Valea Morarului, Valea Seacă a Baiului, Pârâul Lung, Valea Baiului, Pârâul Scurt
• Right: Valea Căldărilor, Valea Priponului, Valea Caprelor, Valea Urzicii, Valea Țapului, Valea Seacă, Valea Scorușilor, Valea Coștilei, Valea Gâlmei