| Justiniac | |
| Commune Status: | Commune |
| Arrondissement: | Pamiers |
| Canton: | Portes d'Ariège |
| Insee: | 09146 |
| Postal Code: | 09700 |
| Mayor: | Christine Vallès[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Portes d'Ariège Pyrénées |
| Coordinates: | 43.2131°N 1.4928°W |
| Elevation M: | 330 |
| Elevation Min M: | 264 |
| Elevation Max M: | 363 |
| Area Km2: | 4.56 |
Justiniac (pronounced as /fr/; oc|Justinhac) is a commune in the Ariège department in southwestern France.
Inhabitants of Justiniac are called Justiniacois in French.