| Castex-d'Armagnac | |
| Commune Status: | Commune |
| Arrondissement: | Condom |
| Canton: | Grand-Bas-Armagnac |
| Insee: | 32087 |
| Postal Code: | 32240 |
| Mayor: | Christian Dupouy[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Grand-Armagnac |
| Coordinates: | 43.8706°N -0.1656°W |
| Elevation M: | 117 |
| Elevation Min M: | 65 |
| Elevation Max M: | 124 |
| Area Km2: | 12.26 |
Castex-d'Armagnac (pronounced as /fr/, literally Castex of Armagnac; oc|Castèths d'Armanhac) is a commune in the Gers department in southwestern France.