| SIAS | Sacramento International Auto Show 
| Others |
| SIAS | SAFI Institute of Advanced Study
| Others |
| SIAS | Salzburg Institute of Actuarial Studies
| Others |
| SIAS | Scandinavian Institute of African Studies
| Others |
| SIAS | School of Indigenous Australian Studies
| Others |
| SIAS | School of Interdisciplinary Arts and Sciences
| Others |
| SIAS | School of International and Area Studies
| Others |
| SIAS | Science Industry Assessment Service
| Others |
| SIAS | Seattle International Auto Show
| Others |
| SIAS | Securities Investors Association Singapore
| Others |
| SIAS | Security Intelligence Analysis Service
| Others |
| SIAS | Shanghai International Auto Show
| Others |
| SIAS | Shropshire Independent Advocacy Scheme
| Others |
| SIAS | Slightly Increased Attack Speed
| Others |
| SIAS | Societa Incremento Automobilistico e Sport
| Others |
| SIAS | Societa Iniziative Autostradali e Servizi
| Others |
| SIAS | Solihull Integrated Addiction Services
| Others |
| SIAS | Some Institutes for Advanced Study
| Others |
| SIAS | Somerset Industrial Archaeological Society
| Others |
| SIAS | Southasia Institute of Advanced Studies
| Others |
| SIAS | Specific Independent Auditing Standard (China)
| Others |
| SIAS | Spectroscopy in a Suitcase
| Others |
| SIAS | Spina iliaca anterior superior
| Others |
| SIAS | Standard Intel Architecture Server
| Others |
| SIAS | Staple Inn Actuarial Society
| Others |
| SIAS | Statements on Internal Auditing Standards
| Others |
| SIAS | Statutory Inspection of Anglican Schools
| Others |
| SIAS | Student Information Access System
| Others |
| SIAS | Student Investment Advisory Service
| Others |
| SIAS | Student Investment Advisory Services
| Others |
| SIAS | Summer Institute for Academic Success
| Others |
| SIAS | Sussex Industrial Archaeology Society
| Others |