| Abbreviation | Definition |
|---|---|
| IAM | International Association of Movers |
| IAMA | International Association of Missionary Aviation |
| IAMAT | International Association for Medical Assistance to Travellers |
| IANR | Institute of Agriculture and Natural Resources |
| IAP2 | International Association for Public Participation |
| IAPAC | International Association of Physicians in AIDS Care |
| IAPMO | International Association of Plumbing and Mechanical Officials |
| IAPSRS | International Association of Psychosocial Rehabilitation Services |
| IARC | Indiana Association of Regional Councils |
| IARI | India Association of Rhode Island |
| IARS | International Anesthesia Research Society |
| IAS | International AIDS Society |
| IAS | Irish Association for Suicidology |
| IASE | International Association for Statistical Education |
| IASH | International Association for Stability Handling and Use of Liquid Fuels |
| IASIS | International Association for Student Insurance Services |
| IASO | International Association for the Study of Obesity |
| IATI | International Aid Transparency Initiative |
| IAUA | Indian American Urological Association |
| IAVA | Iraq and Afghanistan Veterans of America |