| Acronym | Definition |
|---|
| NSS | National Speleological Society |
| NSS | Network Security Services |
| NSS | National Space Society |
| NSS | National Security Strategy |
| NSS | Name Service Switch |
| NSS | National Secular Society (UK) |
| NSS | National Service Scheme (India) |
| NSS | National Student Survey |
| NSS | Novell Storage Services |
| NSS | National Sample Survey (India) |
| NSS | National Security Service (various countries) |
| NSS | Nuclear Science Symposium |
| NSS | Network Security Scanner |
| NSS | National Security Space |
| NSS | National Security System |
| NSS | Not So Sure |
| NSS | National Screen Service |
| NSS | National Search and Rescue Secretariat (Canada) |
| NSS | Network Server System |
| NSS | National Statistical Service |
| NSS | Nair Service Society (Kerala, India) |
| NSS | National Sculpture Society |
| NSS | Network Switching Subsystem |
| NSS | Not Statistically Significant |
| NSS | Normal Saline Solution |
| NSS | National Statistical System (Uganda Bureau of Statistics) |
| NSS | New Skies Satellite |
| NSS | Neutral Salt Spray (corrosion testing) |
| NSS | National Social Service |
| NSS | Negotiation Support System |
| NSS | National Standards System (Canada) |
| NSS | NASA Safety Standard |
| NSS | National Shelter System (US FEMA and American Red Cross) |
| NSS | Nodal Switching System |
| NSS | Naval Simulation System |
| NSS | Nice Skate Shoes (shoe brand) |
| NSS | Network System Security |
| NSS | Network System Security (US Navy program) |
| NSS | Nature Society of Singapore |
| NSS | Native Seeds/SEARCH |
| NSS | Native Structured Storage (Microsoft Windows 2000) |
| NSS | Networked Systems Survivability |
| NSS | Neurological Severity Score |
| NSS | Network Storage Services (data storage technology) |
| NSS | National Seed Service (Nigeria) |
| NSS | New Student System (Maricopa County, AZ community college system project) |
| NSS | National Standards Sampling (education) |
| NSS | Named Saved System |
| NSS | Network Support System |
| NSS | Network Surveillance System |
| NSS | Nielsen Syndication Service |
| NSS | Non-Standard Setup |
| NSS | National Severe Storms Forecast Center (National Weather Service) |
| NSS | Naval Security Station |
| NSS | NetShield Security (Mcafee) |
| NSS | Navigation Safety System |
| NSS | Network and System Services |
| NSS | Network Synchronization Subsystem |
| NSS | National Stockpile Site |
| NSS | Navigation Sonar System |
| NSS | Navy Supply System |
| NSS | Nomad Sound System (band) |
| NSS | Network-based Security Services |
| NSS | Naval Support Station |
| NSS | Network Synthesis System |
| NSS | NetWare Server Support |
| NSS | Namibia Scientific Society |
| NSS | National Sculptor Society |
| NSS | National Specialty Services, Inc. (a Cardinal Health company) |
| NSS | National Supply System |
| NSS | NISI Security Subpanel |
| NSS | Near Space Systems, Inc (Colorado Springs, Colorado) |
| NSS | Naval Surface Strike |
| NSS | National School System |
| NSS | New Start Study |
| NSS | Neutral Salt Solution |
| NSS | Navy Support Software |
| NSS | Nazrul Smriti Sangsad (Bangladesh) |
| NSS | National Support Specialist |
| NSS | New Secret Service (Polish computer magazine) |
| NSS | Network Solutions Service |
| NSS | Navy Strategic Study |
| NSS | Nerang State School (Queensland, Australia) |
| NSS | No Stuff, Sherlock (polite form) |
| NSS | Northern Site Services Ltd (UK building firm) |
| NSS | Network Service Subsystem |
| NSS | No Surprise Sherlock (polite form) |
| NSS | Nightfall Security Solutions, LLC |
| NSS | No Service Scheduling |
| NSS | Ninth Symphony Syndrome |
| NSS | Net Suction Specific Speed |
| NSS | Network Support Service |
| NSS | Native Spanish Speaker |
| NSS | National Stationery Show (trade show) |
| NSS | Network System Support |
| NSS | Natural and Social Sciences (various schools) |
| NSS | Norton Security Scan (software) |
| NSS | National Spatial Strategy (Ireland) |
| NSS | National Senior Showcase (lacrosse) |