| Acronym | Definition |
|---|
| SIAC | Southern Intercollegiate Athletic Conference |
| SIAC | Special Immigration Appeals Commission (UK) |
| SIAC | Singapore International Arbitration Centre (Singapore) |
| SIAC | Sociedad Interamericana de Cardiología (Spanish: Interamerican Society of Cardiology) |
| SIAC | Security Industry Alarm Coalition |
| SIAC | School Improvement Advisory Committee |
| SIAC | Società Italiana Assicurazione Crediti (Italian insurance company) |
| SIAC | Senate Indian Affairs Committee (US Congress) |
| SIAC | Specialized Information Analysis Center |
| SIAC | Securities Industries Automation Corporation |
| SIAC | Surrey Integrated Arts Consortium (UK) |
| SIAC | Société Internationale des Artistes Chrétiens (International Secretariat of Christian Artists) |
| SIAC | Self-Injection Anxiety Counseling |
| SIAC | Senate Committee on Indian Affairs |
| SIAC | Staten Island Athletic Club (New York) |
| SIAC | Système Informatisé d'Aide à la Conduite (French: information system for train engineer in TGV-Trains) |
| SIAC | Systèmes d'Information et d'Aide aux Concours (French: Information Systems and Support for Competition) |
| SIAC | Strike Intelligence Analysis Center |
| SIAC | Sensor Integration and Control |
| SIAC | Submarine Integrated Attack Center |
| SIAC | Site Improvement Advisory Council |
| SIAC | Shape International Angling Club |
| SIAC | System Integration And Control |