| Brassac | |
| Commune Status: | Commune |
| Arrondissement: | Foix |
| Canton: | Val d'Ariège |
| Insee: | 09066 |
| Postal Code: | 09000 |
| Mayor: | Laurence Degraves[1] |
| Term: | 2022 - 2026 |
| Intercommunality: | CA Pays Foix-Varilhes |
| Coordinates: | 42.9469°N 1.5381°W |
| Elevation M: | 550 |
| Elevation Min M: | 447 |
| Elevation Max M: | 1695 |
| Area Km2: | 24.33 |
Brassac (in French pronounced as /bʁasak/; Occitan (post 1500);: Braçac) is a commune in the Ariège department of southwestern France.
Inhabitants of Brassac are called Brassacois.