STSI
| Acronym | Definition |
|---|---|
| STSI | Scalable Time Slot Interchanger |
| STSI | Space Telescope Science Institute |
| STSI | Scripps Translational Science Institute (La Jolla, CA) |
| STSI | State Table Size Index |
| STSI | Surface Transportation Security Inspection (US TSA) |
| STSI | Scalable Time-Slot Interchanger |
| STSI | Sustav Tehnickih Servisa Inc (Croatian engineering company) |