The Piatra Craiului Mountains are a mountain range in the Southern Carpathians in Romania. In Romanian Piatra Craiului means Rock of the King.
The Piatra Craiului mountains form a narrow and saw-like ridge, which is about 25 km long. The highest elevation in the massif is the Vârful La Om with 2238 m.
The ridge is regarded as one of the most beautiful sights in the Carpathians. The two-day north–south ridge trail is both challenging and rewarding. Starting at either Plaiul Foii in the north-west or Curmătura in the north-east, walkers climb up to the ridge before following a somewhat precarious path along the narrow spine. The descent at the southern end leads into a karst landscape of deep gorges and pitted slopes where water penetrating the rock has carved a series of caves.