| Acronym | Definition |
|---|
| SIEC➣Societa Italiana di Ecografia Cardiovascolare (Italian: Italian Society of Cardiovascular Ultrasound) |
| SIEC➣Service Interacadémique des Examens et Concours (French: Interacademic Service Examinations and Competitions; est. 1982) |
| SIEC➣State Interoperability Executive Council |
| SIEC➣Statewide Interoperability Executive Committee (various locations) |
| SIEC➣Suicide Information and Education Centre |
| SIEC➣Southern Illinois Electric Cooperative (electric utility) |
| SIEC➣Service des Investissements de l’Enseignement Catholique |
| SIEC➣Suzhou International Exchange Center |
| SIEC➣Significant Events Conference (US National Military Command Center) |
| SIEC➣Southern Iowa Electric Cooperative |