| NSID | Narcotics and Special Investigation Division 
| Others |
| NSID | Narcotics and Special Investigations Division
| Others |
| NSID | Narcotics Special Investigations Division
| Others |
| NSID | National Security and Intelligence Department
| Others |
| NSID | National Security Investigations Division
| Others |
| NSID | National Society of Interior Designers
| Others |
| NSID | Nepalese Society of Implant Dentistry
| Others |
| NSID | Network State Information Database
| Others |
| NSID | No Shaving In December
| Others |
| NSID | Non Specific Intellectual Disability
| Others |
| NSID | Non Syndromic Intellectual Disability
| Others |
| NSID | Nordic Society for Invention and Discovery
| Others |
| NSID | Nordic Society of Irish Dancers
| Others |
| NSID | North Springs Improvement District
| Others |