| Acronym | Definition |
|---|
| NSID➣National Society of Interior Designers (now American Society of Interior Designers) |
| NSID➣Nordic Society of Irish Dancers |
| NSID➣Narcotics and Special Investigations Division (Washington, DC) |
| NSID➣Network State Information Database (South Korea) |
| NSID➣Non-Specific Intellectual Disability (mental impairment) |
| NSID➣National Safety Industrial Direct (various locations) |