| Omissy | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Quentin |
| Canton: | Saint-Quentin-2 |
| Insee: | 02571 |
| Postal Code: | 02100 |
| Mayor: | Christophe Francois[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Saint-Quentinois |
| Coordinates: | 49.8783°N 3.3128°W |
| Elevation M: | 82 |
| Elevation Min M: | 72 |
| Elevation Max M: | 125 |
| Area Km2: | 7.09 |
Omissy (pronounced as /fr/) is a commune in the Aisne department in Hauts-de-France in northern France.