| Castelnuovo di Farfa | |
| Official Name: | Comune di Castelnuovo di Farfa |
| Coordinates: | 42.2333°N 57°W |
| Region: | Lazio |
| Province: | Rieti (RI) |
| Mayor: | Luca Zonetti |
| Area Total Km2: | 8.84 |
| Population Footnotes: | [1] |
| Population Total: | 1048 |
| Population As Of: | 30 June 2017 |
| Population Demonym: | Castelnovesi |
| Elevation M: | 358 |
| Saint: | St. Nicholas |
| Day: | December 6 |
| Postal Code: | 02031 |
| Area Code: | 0765 |
Castelnuovo di Farfa is a Italian: [[comune]] (municipality) in the Province of Rieti in the Italian region of Latium, located about 40km (30miles) northeast of Rome and about 20km (10miles) southwest of Rieti.