| Sagy | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Sagy (Val-d'Oise).svg |
| Coordinates: | 49.0506°N 1.9528°W |
| Arrondissement: | Pontoise |
| Canton: | Vauréal |
| Mayor: | Guy Paris[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 42 |
| Elevation Max M: | 130 |
| Area Km2: | 10.53 |
| Insee: | 95535 |
| Postal Code: | 95450 |
Sagy (in French pronounced as /saʒi/) is a commune in the Val-d'Oise department and Île-de-France region of France.