| SIAA | Schleife Institute of Advanced Automation 
| Others |
| SIAA | Service Industry Advertising Awards
| Others |
| SIAA | Singapore Industrial Automation Association
| Others |
| SIAA | Societas Iuridica Antiliana et Arubana
| Others |
| SIAA | Southern Intercollegiate Athletic Association
| Others |
| SIAA | Southwest Indian Arts Association
| Others |
| SIAA | Southwest Insurance Agents Alliance
| Others |
| SIAA | Springfield Improvement Association and Archives
| Others |
| SIAA | Stanford International Arbitration Association
| Others |
| SIAA | Strategic Insurance Agency Alliance
| Others |