| Abbreviation | Definition |
|---|---|
| NS | Node Switches |
| NS | Non-Standard |
| NS | Not Specified |
| NS | Nuclear Survivability |
| NS | Number of Ships |
| NSA | National Security Act |
| NSA | National Security Area |
| NSA | National Shipping Authority |
| NSA | NATO (North Atlantic Treaty Organization) Standardization Agency |
| NSA | Naval Support Activity |
| NSAP | Network Service Access Points |
| NSAW | National Salvation Army Week |
| NSAWC | Naval Strike and Air Warfare Center |
| NSBD | Near Ship Battlespace Dominance |
| NSBM | National Space and Ballistic Missile |
| NSC | National Simulations Center |
| NSC | NATO Shipping Centre |
| NSC | Naval Supply Corps |
| NSC/DC | Deputies Committee of The National Security Council |
| NSC/IWG | National Security Council/Interagency Working Group |