| NSSC | NASA Shared Services Center 
| Others |
| NSSC | NASA Standard Spacecraft Computer
| Others |
| NSSC | Natick Soldier Systems Center
| Others |
| NSSC | National Safety and Security Council
| Others |
| NSSC | National School Safety Center
| Others |
| NSSC | National Security Strategies Conference
| Others |
| NSSC | National Security Studies Course
| Others |
| NSSC | National Senior Service Corps
| Others |
| NSSC | National Soil Survey Center
| Others |
| NSSC | National Standards Strategy Committee
| Others |
| NSSC | National Strategy to Secure Cyberspace
| Others |
| NSSC | National Supply Service Center
| Others |
| NSSC | National Sustainable Structures Center
| Others |
| NSSC | Naval Sea Systems Command (non-standard)
| Others |
| NSSC | Neutral Sulfite Semi-Chemical
| Others |
| NSSC | Newhaven and Seaford Sailing Club
| Others |
| NSSC | NOAO System Science Center
| Others |
| NSSC | North Scottsdale Soccer Club
| Others |
| NSSC | North Shore Senior Center
| Others |
| NSSC | North Shore Swim Club
| Others |
| NSSC | North Springfield Swim Club
| Others |
| NSSC | North Star Sail Club
| Others |
| NSSC | North State Shooting Club
| Others |
| NSSC | Nova Scotia Supreme Court
| Others |
| NSSC | Nuclear Science and Security Consortium
| Others |
| NSSC | Nuclear Security Services Company
| Others |
| NSSC | Nul System Services Corporation
| Others |