| Acronym | Definition |
|---|
| IAOS➣International Association for Official Statistics |
| IAOS➣International Association for Obsidian Studies |
| IAOS➣Irish Agricultural Organisation Society (est. 1894; Ireland) |
| IAOS➣Illinois Association of Orthopaedic Surgeons (Chicago, IL) |
| IAOS➣Illumination-Induced Apparent Orientation Shift |
| IAOS➣Integrated Automated Orders System |