| Castellare-di-Mercurio | |
| Commune Status: | Commune |
| Arrondissement: | Corte |
| Canton: | Golo-Morosaglia |
| Insee: | 2B078 |
| Postal Code: | 20250 |
| Mayor: | Mathieu Giudicelli[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 42.3114°N 9.2478°W |
| Elevation M: | 600 |
| Elevation Min M: | 331 |
| Elevation Max M: | 1416 |
| Area Km2: | 6.12 |
Castellare-di-Mercurio is a commune in the Haute-Corse department of France on the island of Corsica.