The Monti Simbruini are a mountain range in central Italy, part of Apennines, on the border between the Lazio and Abruzzo regions. They border with the Monti Cantari and the Ciociaria.
The name derives from the Latin sub imbribus ("under the rain"). They are also popularly known as "Rome's Alps". The highest peak is the Monte Cotento (2,015 m).
The River Aniene has its source within in the range.
The Regional Park of the Monti Simbruini was founded on January 29, 1983. It includes also the Monti Cantari, with an area of 300 square kilometres including the comuni of Camerata Nuova, Cervara di Roma (Campaegli), Filettino, Jenne, Subiaco (Monte Livata), Trevi nel Lazio and Vallepietra.