| Mainvilliers | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Mainvilliers.svg |
| Arrondissement: | Chartres |
| Canton: | Chartres-3 |
| Insee: | 28229 |
| Postal Code: | 28300 |
| Mayor: | Michèle Bonthoux[1] |
| Term: | 2022 - 2026 |
| Intercommunality: | CA Chartres Métropole |
| Coordinates: | 48.4539°N 1.4628°W |
| Elevation M: | 125 |
| Elevation Min M: | 133 |
| Elevation Max M: | 165 |
| Area Km2: | 11.92 |
Mainvilliers (in French pronounced as /mɛ̃vilje/) is a commune in the Eure-et-Loir department in northern France. The sixth largest city in the department by population, its inhabitants are called Mainvillois and Mainvilloises.