| Grenier-Montgon | |
| Commune Status: | Commune |
| Arrondissement: | Brioude |
| Canton: | Sainte-Florine |
| Mayor: | Jacques Filiol[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 45.2886°N 3.1956°W |
| Elevation Min M: | 504 |
| Elevation Max M: | 694 |
| Area Km2: | 5.01 |
| Insee: | 43103 |
| Postal Code: | 43450 |
Grenier-Montgon (in French pronounced as /ɡʁənje mɔ̃ɡɔ̃/) is a commune in the Haute-Loire department in south-central France.