| Rank | Abbreviation | Meaning |
|---|
| ***** | SIAA | Society of Incorporated Accountants and Auditors
| |
| ***** | SIAA | Severity Index for Adults with AIDS
| |
| ***** | SIAA | Seed Industry Association of Australia, Limited
| |
| ***** | SIAA | Societas Iuridica Antiliana et Arubana
| |
| ***** | SIAA | Software Industry Association of America
| |
| **** | SIAA | Shareef Islam Allahu Akbar
| |
| **** | SIAA | Seafood Importers Association of Australia
| |
| **** | SIAA | Science Industry Action Agenda
| |
| **** | SIAA | Swiss International Airport Association
| |
| **** | SIAA | Strategic Insurance Agency Alliance
| |
| *** | SIAA | Southeastern Intercollegiate Athletic Association
| |
| *** | SIAA | School of Interactive and Algorithmic Art
| |
| *** | SIAA | state impact assistance account
| |
| *** | SIAA | Simulation Industry Association of Australia
| |
| *** | SIAA | Singapore Industrial Automation Association
| |
| *** | SIAA | Support for Investment in Assisted Areas
| |
| ** | SIAA | Scottish Independent Advocacy Alliance
| |
| ** | SIAA | Strategic Independent Agency Alliance
| |
| ** | SIAA | Saskatchewan Intergovernmental and Aboriginal Affairs
| |
| * | SIAA | Surrender of Illicit Arms Act
| |
| * | SIAA | Strategic Insurance Agents Alliance
| |
| * | SIAA | Security and Investigations Agents Act
| |
| * | SIAA | South Iredell Athletic Association
| |
| * | SIAA | Southern Illinois Airport Authority
| |
| * | SIAA | She is an Astronomer
| |