| Lassy | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Lassy (Val-d'Oise).svg |
| Coordinates: | 49.0978°N 2.4467°W |
| Arrondissement: | Sarcelles |
| Canton: | Fosses |
| Mayor: | Gilbert Maugan[1] |
| Term: | 2020 - 2026 |
| Area Km2: | 1.92 |
| Insee: | 95331 |
| Postal Code: | 95270 |
Lassy (in French pronounced as /lasi/) is a commune in the Val-d'Oise department and Île-de-France region of France.