| Abbreviation | Definition |
|---|---|
| ISAA | Illinois State Auctioneers Association |
| ISAA | Indonesian Shipping Agency Association |
| ISAA | Intermountain Ski Areas Association |
| ISAA | Iowa State Archery Association |
| ISAA | Iowa State Association of Assessors |
| ISAC | Iowa State Association of Counties |
| ISACA | Information System Audit and Control Association |
| ISACA | Information Systems Audit Control Association |
| ISACA | Information Systems Automation and Control Association |
| ISACA | Iowa State Association of County Auditors |
| ISAI | Ice Skating Association Of Ireland |
| ISAK | Indian Students Association Kaiserslautern |
| ISAL | Indian Student Association of Leuven |
| ISAN | Iranian Scientific Association in the Netherlands |
| ISAP | Iranian Student Association of Portland |
| ISAQ | Indonesian Student Association of QUT |
| ISAR | Indiana State Association of Remanufacturers |
| ISARA | International Spatial Accuracy Research Association |
| ISARC | Indian Student Association of Rivier College |
| ISBA | Idaho School Board Association |