| Castex | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Girons |
| Canton: | Arize-Lèze |
| Insee: | 09084 |
| Postal Code: | 09350 |
| Mayor: | Anne Courtial[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.1672°N 1.3133°W |
| Elevation M: | 375 |
| Elevation Min M: | 248 |
| Elevation Max M: | 394 |
| Area Km2: | 7.03 |
Castex is a commune in the Ariège department of southwestern France.
Its inhabitants are called Castetois.