| Lachapelle-Graillouse | |
| Commune Status: | Commune |
| Arrondissement: | Largentière |
| Canton: | Haute-Ardèche |
| Insee: | 07121 |
| Postal Code: | 07470 |
| Mayor: | Roland Jallat[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 44.8133°N 4.0208°W |
| Elevation M: | 1120 |
| Elevation Min M: | 868 |
| Elevation Max M: | 1233 |
| Area Km2: | 20.48 |
Lachapelle-Graillouse (pronounced as /fr/; oc|La Chapèla Gralhosa) is a commune in the Ardèche department in southern France.