| Acronym | Definition |
|---|
| SSN | Social Security Number |
| SSN | Attack Submarine (Nuclear Propulsion) |
| SSN | Servizio Sanitario Nazionale (Italian Health Service) |
| SSN | Simultaneous Switching Noise |
| SSN | Silver Spring Networks (Redwood City, CA) |
| SSN | Subsystem Number (SS7) |
| SSN | Subsystem Number |
| SSN | Session Service |
| SSN | Segment Sequence Number |
| SSN | Storage System Number |
| SSN | Smoothed Sunspot Number |
| SSN | Space Surveillance Network |
| SSN | Social Safety Net |
| SSN | Social Services Network (Canada) |
| SSN | Standard Shipping Note (trade) |
| SSN | Senior Secured Note (finance) |
| SSN | Soul of the South Network |
| SSN | Super Sports Network (German TV) |
| SSN | SafeSeaNet (vessel traffic monitoring and information system) |
| SSN | Social Solidarity Network (Ireland) |
| SSN | Ship, Submersible, Nuclear |
| SSN | Standard Study Number |
| SSN | Secure Server Network |
| SSN | Switched Service Network |
| SSN | Suprasternal Notch (anatomy) |
| SSN | Station Serial Number |
| SSN | Submersible Ship Nuclear |
| SSN | Solución Salina Normal (Spanish) |
| SSN | Silicon Serial Number |
| SSN | Swiss Society for Nutrition (Switzerland) |
| SSN | Superior Salivary Nucleus (facial nerve nucleus) |
| SSN | Soldier Support Network |
| SSN | Sub-Surface Navigation |
| SSN | Specification Serial Number |
| SSN | Synchronous Sequential Network |
| SSN | Segment Serial Number |
| SSN | System Sequence Number |
| SSN | Swept Spot Noise |
| SSN | Sprint Service Node |
| SSN | Streaming Sports Network, LLC (Ottawa, Canada) |
| SSN | Sense Selection Network (natural language processing) |
| SSN | System Study Number |
| SSN | Subscriber Sequence Number |