| Mas-Grenier | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de mas-grenier.svg |
| Arrondissement: | Montauban |
| Canton: | Verdun-sur-Garonne |
| Insee: | 82105 |
| Postal Code: | 82600 |
| Mayor: | Bernadette Prouet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Grand-Sud Tarn-et-Garonne |
| Coordinates: | 43.8914°N 1.1972°W |
| Elevation M: | 108 |
| Elevation Min M: | 84 |
| Elevation Max M: | 174 |
| Area Km2: | 24.66 |
Mas-Grenier (pronounced as /fr/; oc|Le Mas Granièr) is a commune in the Tarn-et-Garonne department in the Occitanie region in southern France.