| Saint-Martin-d'Armagnac | |
| Commune Status: | Commune |
| Arrondissement: | Condom |
| Canton: | Grand-Bas-Armagnac |
| Insee: | 32390 |
| Postal Code: | 32110 |
| Mayor: | Eric Artigole[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Bas-Armagnac |
| Coordinates: | 43.7147°N -0.0619°W |
| Elevation M: | 150 |
| Elevation Min M: | 97 |
| Elevation Max M: | 175 |
| Area Km2: | 10.8 |
Saint-Martin-d'Armagnac (in French pronounced as /sɛ̃ maʁtɛ̃ daʁmaɲak/, literally Saint-Martin of Armagnac; Occitan (post 1500);: Sent Martin d'Armanhac) is a commune in the Gers department in southwestern France.