ONSC
| Acronym | Definition |
|---|---|
| ONSC | Ozark Natural Science Center (Huntsville, AR) |
| ONSC | Office of National Security Coordination (Departmet of Homeland Security / FEMA) |
| ONSC | Oficina Nacional de Servicio Civil (Spanish: National Civil Service Office; Uraguay) |
| ONSC | Old North State Council (Boy Scouts of America; North Carolina) |
| ONSC | Obligaciones Negociables Subordinadas Convertibles (Spanish: Convertible Subordinated Notes; Argentina) |