| Acronym | Definition |
|---|
| SSPI | Security Support Provider Interface (Microsoft) |
| SSPI | Security Support Provider Interface |
| SSPI | Security Service Provider Interface |
| SSPI | Society of Satellite Professionals International |
| SSPI | Security Service Provider Interface (Microsoft) |
| SSPI | Steady-State Plasma Insulin |
| SSPI | Service de Salubrité et Prévention Incendie (French: Department of Safety and Fire Prevention; Switzerland) |
| SSPI | Signs and Symptoms of Psychotic Illness (rating scale) |
| SSPI | Salle de Soins Post-Interventionnels (French: Post-Interventional Room Care; recovery room) |
| SSPI | Soldier Sensor/Platform Interface (ITT) |