| Abbreviation | Definition |
|---|---|
| IANL | Islamic Association of North London |
| IANN | India Association Of Northern Nevada |
| IANO | India Association of New Orleans |
| IANPHI | International Association of National Public Health Institutes |
| IAO | Incorporated Association of Organists |
| IAO | International Association of Orthodontics |
| IAOC | Industries Association of Chandigarh |
| IAOC | International Association of Costume |
| IAOM | International Association of Management |
| IAOM | International Association of Orofacial Myology |
| IAOP | International Association of Outsourcing Professionals |
| IAP | International Association of Pancreatology |
| IAP | International Association of Penturners |
| IAP | International Association of Prosecutors |
| IAPA | Illinois Activity Professionals Association |
| IAPA | Illinois Asphalt Pavement Association |
| IAPA | Independent Airport Parking Association |
| IAPA | Independent Automotive Professionals Association |
| IAPA | Indian Association of Paediatric Anaesthesiologists |
| IAPA | Indian Association of Physician Assistants |