| Marchastel | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Flour |
| Canton: | Riom-ès-Montagnes |
| Insee: | 15116 |
| Postal Code: | 15400 |
| Mayor: | Jean-Maurice Emorine[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays Gentiane |
| Coordinates: | 45.2839°N 2.7258°W |
| Elevation M: | 929 |
| Elevation Min M: | 769 |
| Elevation Max M: | 1176 |
| Area Km2: | 22.92 |
Marchastel (in French pronounced as /maʁʃastɛl/; Occitan (post 1500);: Marchastèl) is a commune in the Cantal department in south-central France.