The Sibillini Mountains, or Sibylline Mountains (Italian: Monti Sibillini) are one of the major mountain groups in the Italian Peninsula, and part of the Apennines range. Most of the peaks are over ; the highest is Monte Vettore at .
Since 1993 the area has been part of the Parco Nazionale dei Monti Sibillini (Sibillini Mountains National Park).
The present-day landscape morphology, predominantly U-shaped valleys and glacial depressions, is due to the action of glaciers during the Quaternary period.
Wildlife and vegetation crested porcupine Eurasian eagle owl golden eagle peregrine falcon roe deer viper wildcat wolf
The small Lago di Pilato within a deep U-shaped valley below Monte Vettore, is home to a crustacean endemic to this location, Chirocephalus marchesonii.
The area contains stands of beech scattered amongst open subalpine grasslands and meadows maintained by the grazing of sheep.
See also Apennines Geography of Italy Monte Ascensione
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