| Acronym | Definition |
|---|
| SIV | Simian Immunodeficiency Virus |
| SIV | Sykehuset I Vestfold (Norwegian hospital) |
| SIV | Seasonal Influenza Vaccine |
| SIV | Swine Influenza Virus |
| SIV | Structured Investment Vehicle |
| SIV | System Information Viewer |
| SIV | Système d'Immatriculation des Véhicules (French: Vehicle Registration System) |
| SIV | Suporte Imediato de Vida (Portuguese: Immediate Life Support) |
| SIV | Small Islands Voice |
| SIV | Self-Inflicted Violence |
| SIV | Special Immigrant Visa (US State Department) |
| SIV | Special Investment Vehicle |
| SIV | Special Interest Vessel (US DoD) |
| SIV | Speaker Identification and Verification (speech recognition) |
| SIV | Société Industrielle de Vitrines (French metalwork company) |
| SIV | Simulation d'Incident en Vol (French: Simulated Incidence in Flight; paragliding) |
| SIV | Site Initiation Visit |
| SIV | Setto Interventricolare (Italian) |
| SIV | Servizio Informazioni del Vaticano (Frontier magazine march 2008, article about extraterrestial contact) |
| SIV | Situs Inversus Viscerum |
| SIV | Silo Interface Vault (missile defense) |
| SIV | Sorry I Vanished (chat) |
| SIV | Speed Increase Valve |
| SIV | Sound in Video |
| SIV | Safety Interlocks Valid |
| SIV | System Integration Van/Vehicle |
| SIV | Sensors in Vacuum (engineering) |
| SIV | Service d'Immuno Virologies (French: Immunovirology Department; Atomic Energy Commission) |
