| NSEC | Nano Second 
| Others |
| NSEC | Nanoscale Science and Engineering Center
| Others |
| NSEC | National Safety Education Center
| Others |
| NSEC | National Science Engineering Competition
| Others |
| NSEC | National Scientific Equipment Center
| Others |
| NSEC | National Security Education Center
| Others |
| NSEC | National Security Engineering Center
| Others |
| NSEC | National Sequestration Education Center
| Others |
| NSEC | National Standard Examination in Chemistry
| Others |
| NSEC | National Student Education Conference
| Others |
| NSEC | National Supported Employment Conference
| Others |
| NSEC | Near Southside Employment Coalition
| Others |
| NSEC | Netaji Subhash Engineering College
| Others |
| NSEC | Network of STEM Education Centers
| Others |
| NSEC | Network Switching Engineering Center
| Others |
| NSEC | New Student Experience Center
| Others |
| NSEC | North Shore Events Centre
| Others |
| NSEC | North Sydney English College
| Others |
| NSEC | Norwegian Seafood Export Council
| Others |