| 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) |