| Saint-Martin-l'Astier | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Martin-l’Astier 24.svg |
| Arrondissement: | Périgueux |
| Canton: | Vallée de l'Isle |
| Insee: | 24457 |
| Postal Code: | 24400 |
| Mayor: | Jean-Luc Tomski[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 45.0569°N 0.33°W |
| Elevation M: | 45 |
| Elevation Min M: | 39 |
| Elevation Max M: | 147 |
| Area Km2: | 9.40 |
Saint-Martin-l'Astier (pronounced as /fr/; Limousin: Sent Martin l'Astier) is a commune in the Dordogne department in Nouvelle-Aquitaine in southwestern France.