| Abbreviation | Definition |
|---|---|
| NS | Not Submitted |
| NSA/CSS | National Security Agency/Central Security Service |
| NSAC | Nuclear Science Advisory Committee |
| NSAF | National Survey of America's Families |
| NSB | National Science Board |
| NSC | National Security Caucus |
| NSC | National Security Community |
| NSCD | National Surveillance Case Definition |
| NSCEP | National Service Center for Environmental Publications (EPA) |
| NSCF | National Security Caucus Foundation |
| NSEZ | Non-State Economic Zone |
| NSF | National Sanitation Foundation |
| NSF | National Standard Format |
| NSF | Non-Specific Finding |
| NSG | National Statuary Hall |
| NSG | No Such Group |
| NSH | National Statuary Hall |
| NSHA | National Study of Health and Activity |
| NSLDS | National Student Loans Database System |
| NSN | National Security Network |