| Sermaise | |
| Commune Status: | Commune |
| Coordinates: | 48.5367°N 2.0809°W |
| Insee: | 91593 |
| Postal Code: | 91530 |
| Arrondissement: | Étampes |
| Canton: | Dourdan |
| Intercommunality: | Le Dourdannais en Hurepoix |
| Mayor: | Magali Hautefeuille[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 71 |
| Elevation Max M: | 159 |
| Area Km2: | 13.60 |
Sermaise (pronounced as /fr/) is a commune in the Essonne department in Île-de-France in northern France.
Inhabitants of Sermaise are known as Sermaisiens.