| Fontechiari | |
| Official Name: | Comune di Fontechiari |
| Coordinates: | 41.6667°N 54°W |
| Region: | Lazio |
| Province: | Frosinone (FR) |
| Mayor: | Pierino Liberato Serafini |
| Area Total Km2: | 16 |
| Population Footnotes: | [1] |
| Population Total: | 1289 |
| Population As Of: | 30 November 2019 |
| Population Demonym: | Fontechiaresi |
| Elevation M: | 375 |
| Postal Code: | 03030 |
| Area Code: | 0776 |
Fontechiari is a town and comune in the province of Frosinone, Lazio, central Italy. Located in the Comino Valley, the town has borders with the municipalities of Arpino, Broccostella, Casalvieri, Posta Fibreno and Vicalvi.