| Castelnuovo Parano | |
| Official Name: | Comune di Castelnuovo Parano |
| Coordinates: | 41.3667°N 58°W |
| Region: | Lazio |
| Province: | Frosinone (FR) |
| Frazioni: | Casali, Terra, Valli-Sant'Antonio, Cisterna, Pimpinelli |
| Mayor: | Oreste De Bellis |
| Area Total Km2: | 9.88 |
| Population Footnotes: | [1] |
| Population Total: | 884 |
| Population As Of: | 28 February 2017 |
| Population Demonym: | Castelnovesi |
| Elevation M: | 310 |
| Saint: | St. Maurus |
| Day: | 15 January |
| Postal Code: | 03040 |
| Area Code: | 0776 |
Castelnuovo Parano is a comune (municipality) in the province of Frosinone in the Italian region Lazio, located about 120km (80miles) southeast of Rome and about 45km (28miles) southeast of Frosinone.
It originates from a castle built here in 1059 by abbot Desiderius of Montecassino to defend the area between Fratte and Traetto. The area was severely damaged during World War II due to its position across the Gustav Line. After the end of the conflict, much of the population emigrated.