| Mercenac | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Girons |
| Canton: | Portes du Couserans |
| Insee: | 09187 |
| Postal Code: | 09160 |
| Mayor: | Raymond Coumes[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.0414°N 1.0783°W |
| Elevation M: | 350 |
| Elevation Min M: | 328 |
| Elevation Max M: | 544 |
| Area Km2: | 13.57 |
Mercenac (in French pronounced as /mɛʁsənak/) is a commune in the Ariège department in southwestern France.