| Abbreviation | Definition |
|---|---|
| IAPO | Illinois Alliance to Prevent Obesity |
| IAPO | International Alliance of Patients Organizations |
| IAPS | International Alliance for Pediatric Stroke |
| IARA | International Automotive Remarketers Alliance |
| IARA | Iowa Alliance for Responsible Agriculture |
| IARD | International Alliance for Responsible Drinking |
| IART | International Alliance of Racquet Technicians |
| IASA | International American Student Alliance |
| IASE | International Alliance in Service and Education |
| IATSE | International Alliance of Theatrical Stage Employes |
| IAU | International Alliance of Urolithiasis |
| IAUA | Ithaca Area Ultimate Alliance |
| IAVA | Iranian American Volunteer Alliance |
| IAWA | International Animal Welfare Alliance |
| IAWC | International Alliance for Well Control |
| IAWD | International Alliance of Web Developers |
| IBA | Independence Business Alliance |
| IBA | International Broker Alliance |
| IBAW | India Business Alliance on Water |
| IBCA | Integrated Business Communications Alliance |