| Abbreviation | Definition |
|---|---|
| SAIMUN | St Andrew's International Model United Nations |
| SAIN | Sexual Abuse Intervention Network |
| SAIN | Southern Appalachian Information Node |
| SAIN | Synchronized Adaptive INfrastructure and |
| SAINE | Sain |
| SAINT | SiteCatalyst Attribute Importing and Naming Tool |
| SAINT | Stop Anything In No Time |
| SAINTS | Sanken Amenity Intelligence Newly Total System |
| SAIO | Sale All in One |
| SAIO | Service Académique d'Information et d'Orientation |
| SAIO | South Africa Initiatives Office |
| SAIP | Soulcraft Apprenticeship and Initiation Program |
| SAIP | Stichting Administratie Indonesische Pensioenen |
| SAIP | Strategic Actionable Intelligence Platform |
| SAIP | Substance Abuse Intervention Program |
| SAIPA | Societe Annonyme Iranienne De Production Automobile |
| SAIR | South Asia Intelligence Review |
| SAIRS | San Antonio Immunization Registry System |
| SAIRS | San Antonio Immunization Repository System |
| SAIS | Saudi Arabian International School |