| Mareil-sur-Mauldre | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Mareil-sur-Mauldre (Yvelines).svg |
| Arrondissement: | Saint-Germain-en-Laye |
| Canton: | Aubergenville |
| Insee: | 78368 |
| Postal Code: | 78124 |
| Mayor: | Nathalie Cahuzac[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 48.8956°N 1.87°W |
| Elevation M: | 47 |
| Elevation Min M: | 34 |
| Elevation Max M: | 127 |
| Area Km2: | 4.33 |
Mareil-sur-Mauldre (in French pronounced as /maʁɛj syʁ moldʁ/, literally Mareil on Mauldre) is a commune in the Yvelines department in the Île-de-France region in north-central France.