| Acronym | Definition |
|---|
| CNSS | Committee on National Security Systems (formerly NSTISSC) |
| CNSS | Caisse Nationale de Sécurité Sociale (Morocco) |
| CNSS | Committee of National Security Systems |
| CNSS | Center for National Security Studies |
| CNSS | Council of the National Seismic System |
| CNSS | Core Nodal Switching Subsystem |
| CNSS | Central Nervous System Studies (US NIH) |
| CNSS | Central Nervous System Symptoms |
| CNSS | Computer and Network Security Symposium |
| CNSS | Caisse Nationale de Solidarité Sociale |
| CNSS | China Node for Sustainable Sanitation (Ecological Sanitation Research Programme; Stockholm, Sweden) |