IAOS
| 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 |