| Marcillat | |
| Commune Status: | Commune |
| Arrondissement: | Riom |
| Canton: | Saint-Georges-de-Mons |
| Insee: | 63208 |
| Postal Code: | 63440 |
| Mayor: | Bernard Lescure[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Combrailles Sioule et Morge |
| Coordinates: | 46.0806°N 3.0378°W |
| Elevation M: | 450 |
| Elevation Min M: | 340 |
| Elevation Max M: | 650 |
| Area Km2: | 11.76 |
Marcillat (in French pronounced as /maʁsija/; Occitan (post 1500);: Marcilhac) is a commune in the Puy-de-Dôme department in Auvergne-Rhône-Alpes in central France.