| Armentieux | |
| Commune Status: | Commune |
| Arrondissement: | Mirande |
| Canton: | Pardiac-Rivière-Basse |
| Insee: | 32008 |
| Postal Code: | 32230 |
| Mayor: | Patrick Larribat[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Bastides Vallons Gers |
| Coordinates: | 43.5211°N 0.0917°W |
| Elevation M: | 159 |
| Elevation Min M: | 141 |
| Elevation Max M: | 221 |
| Area Km2: | 4.83 |
Armentieux (Occitan (post 1500);: Armentiu) is a commune in the Gers department in southwestern France.
Armentieux is located in the canton of Pardiac-Rivière-Basse and in the arrondissement of Mirande.