SNSI
| Acronym | Definition |
|---|---|
| SNSI | Sunbelt Network Security Inspector |
| SNSI | Senior Naval Science Instructor (various schools) |
| SNSI | Scuba Nitrox Safety International (Topsham, ME) |
| SNSI | Spay-Neuter Services of Indiana, Inc (Indianapolis, Indiana) |
| SNSI | Secret National Security Information |
| SNSI | Safe Net Secure Internet |