| Abbreviation | Definition |
|---|---|
| IDRA | Interior Department Recreation Association |
| IDRA | International Drone Racing Association |
| IDSA | Interior Design Student Association |
| IDSA | International Dance Sport Association |
| IDSA | International Distance Skateboard Association |
| IDTA | Illinois Drill Team Association |
| IDTA | International Dance Teachers Association |
| IDTA | Irish Dental Trade Association |
| IEA | Interfaith Encounter Association |
| IEA | International Enneagram Association |
| IEA | International Epidemiological Association |
| IEA | International Epidemiology Association |
| IEA | Interscholastic Equestrian Association |
| IEA | Italy Economic Association |
| IEBA | Inland Empire Beekeepers Association |
| IEBA | International Economics Business Association |
| IECA | Independent Electrical Contractors Association |
| IECA | Intercounty Electric Cooperative Association |
| IECA | International Energy Credit Association |
| IECA | International Erosion Control Association |