| Rank | Abbreviation | Meaning |
|---|
| ***** | SSAI | Scuola Superiore dell'Amministrazione dell'Interno (Italian: School of the Administration of the Interior; Italy)
| |
| ***** | SSAI | Spielberger State Anxiety Inventory
| |
| **** | SSAI | Scandinavian Society of Anaesthesiology and Intensive Care Medicine
| |
| **** | SSAI | Six Sigma Advantage Inc
| |
| **** | SSAI | Scoliosis Support Association of Ireland
| |
| *** | SSAI | Senior Service America Inc
| |
| *** | SSAI | Shooting Sports Association of Ireland
| |
| *** | SSAI | Support Systems Associates, Incorporated
| |
| *** | SSAI | Sigma Services of America Inc
| |
| *** | SSAI | Sanitary Supply Association Incorporated
| |
| ** | SSAI | Sports Association of Ireland
| |
| ** | SSAI | Sternberg State Astronomical Institute
| |
| ** | SSAI | Statistical Society of Australia Incorporated
| |
| ** | SSAI | Statistical Society of Australia, Inc.
| |
| ** | SSAI | Swiss Society for Allergology and Immunology (Bern, Switzerland)
| |
| ** | SSAI | Services of America Inc
| |
| * | SSAI | Services Association of Illinois
| |
| * | SSAI | Simulation Systems and Applications Inc
| |
| * | SSAI | Science Systems Applications Inc
| |
| * | SSAI | Sustainable Shellfish Aquaculture Initiative
| |
| * | SSAI | Scandinavian Society of Anaesthesia and Intensive
| |
| * | SSAI | System Sales of Arizona Incorporated
| |
| * | SSAI | Siocon Subanen Association Inc
| |
| * | SSAI | Stellenbosch South Africa Information
| |
| * | SSAI | Software Security Assessment Instrument
| |