| Montgailhard | |
| Commune Status: | Commune |
| Arrondissement: | Foix |
| Canton: | Foix |
| Insee: | 09207 |
| Postal Code: | 09330 |
| Mayor: | Michel Caux[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Pays Foix-Varilhes |
| Coordinates: | 42.9353°N 1.6353°W |
| Elevation M: | 442 |
| Elevation Min M: | 394 |
| Elevation Max M: | 941 |
| Area Km2: | 7.93 |
Montgailhard (in French pronounced as /mɔ̃ɡajaʁ/; Occitan (post 1500);: Montgalhard; before 2022: Montgaillard) is a commune in the Ariège department in southwestern France.