| Silly-le-Long | |
| Commune Status: | Commune |
| Arrondissement: | Senlis |
| Canton: | Nanteuil-le-Haudouin |
| Insee: | 60619 |
| Postal Code: | 60330 |
| Mayor: | Daniel Lefranc[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de Valois |
| Coordinates: | 49.1078°N 2.7925°W |
| Elevation M: | 116 |
| Elevation Min M: | 98 |
| Elevation Max M: | 127 |
| Area Km2: | 11.35 |
Silly-le-Long (in French pronounced as /siji lə lɔ̃/) is a commune in the Oise department in northern France.