| Saint-Vrain | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Vrain (Essonne).svg |
| Coordinates: | 48.5408°N 2.3334°W |
| Insee: | 91579 |
| Postal Code: | 91770 |
| Arrondissement: | Palaiseau |
| Canton: | Brétigny-sur-Orge |
| Intercommunality: | Val d'Essonne |
| Mayor: | Corinne Cordier[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 51 |
| Elevation Max M: | 83 |
| Area Km2: | 11.57 |
Saint-Vrain (in French pronounced as /sɛ̃ vʁɛ̃/) is a commune in the Essonne department in Île-de-France in northern France.
Since 2001, Thaxted (Essex, England) has been twinned with Saint-Vrain. A twinning association aims to promote friendship and cultural understanding and to foster the relationship between the two towns and their people.
The Juine forms the commune's southeastern border.
Inhabitants of Saint-Vrain are known as Saint-Vrainois in French.
A castle with a historic zoological park (with reconstructions of prehistoric scenes) is located here, but has been closed to the public since 1998. The town also has a Louis XV-era obelisk and a thirteenth-century church.