NSID
| 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) |