| Abbreviation | Definition |
|---|---|
| IASIS | International Association of Student Insurance Services |
| IASLC | Internatinoal Association for the study of Lung Cancer |
| IASLC | International Association for the Study of Lung Cancer |
| IASM | Indian Association of Sports Medicine |
| IASP | Indiana Association of School Principals |
| IASP | Indiana Association of School Psychologists |
| IASP | International Association for Suicide Prevention |
| IASP | International Association of Safety Professionals |
| IASPEI | International Association of Seismology and Physics of the |
| IASPRR | International Association of Sexual Plant Reproduction Research |
| IASS | International Association for Scandinavian Studies |
| IASS | International Association for Semiotic Studies |
| IASS | International Association for Shell and Spatial |
| IASS | International Association of Scandinavian Studies |
| IASS | International Association of Survey Statisticians |
| IASSA | Indian Association of Surgeons for Sleep Apnoea |
| IAST | India Association of Southeast Texas |
| IATA | International Air Transport Association |
| IATA | International Air Transport Association: |
| IATA | International Amateur Theatre Association |