| Saint-Germain-de-la-Grange | |
| Commune Status: | Commune |
| Arrondissement: | Rambouillet |
| Canton: | Aubergenville |
| Insee: | 78550 |
| Postal Code: | 78640 |
| Mayor: | Bertrand Hauet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Cœur d'Yvelines |
| Coordinates: | 48.8342°N 1.9003°W |
| Elevation M: | 103 |
| Elevation Min M: | 57 |
| Elevation Max M: | 170 |
| Area Km2: | 5.23 |
Saint-Germain-de-la-Grange (in French pronounced as /sɛ̃ ʒɛʁmɛ̃ də la ɡʁɑ̃ʒ/) is a commune in the Yvelines department in the Île-de-France region in north-central France.