| Illartein | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Girons |
| Canton: | Couserans Ouest |
| Insee: | 09141 |
| Postal Code: | 09800 |
| Mayor: | Dalia Dedieu[1] |
| Term: | 2021 - 2026 |
| Coordinates: | 42.9378°N 0.9667°W |
| Elevation M: | 560 |
| Elevation Min M: | 555 |
| Elevation Max M: | 1721 |
| Area Km2: | 3.97 |
Illartein is a commune in the Ariège department in southwestern France.