| SNIS | Sanitation National Information System 
| Others |
| SNIS | Sarah Noble Intermediate School
| Others |
| SNIS | School Nurse Information System
| Others |
| SNIS | Sharanya Narayani International School
| Others |
| SNIS | Sheffield Neighbourhood Information System
| Others |
| SNIS | Shunt Non Interfering Successive
| Others |
| SNIS | Siemens Nixdorf Information Systems
| Others |
| SNIS | Simple Network Information Server
| Others |
| SNIS | Space Network IP (Internet Protocol) Services
| Others |
| SNIS | Spinal Nerve Injection Study
| Others |
| SNIS | Superconductor-Normal metal-Insulator-Semiconductor
| Others |
| SNIS | Swiss Network for International Studies
| Others |