| Abbreviation | Definition |
|---|---|
| IMASA | Islamic Medical Association of South Africa |
| IMAY | Indian Merchants Association of Yokohama |
| IMBRA | International Model Boat Racing Association |
| IMCA | I M C A International Meteorite Collectors Association |
| IMCA | Industrial Macromolecular Crystallography Association |
| IMCA | Industrial Municipal Cleaning Association |
| IMCA | International Meteorite Collectors Association |
| IMCA | International Moth Class Association |
| IMCA | International Motor Contest Association |
| IMDA | Illinois Motorcycle Dealers Association |
| IMDA | In Mold Decorating Association |
| IMDA | Independent Motor Dealers Association |
| IMDA | International Metal Decorators Association |
| IMDA | International Midas Dealers Association |
| IMDA | Irish Medical Devices Association |
| IMEA | Independent Medical Examination Association |
| IMEA | Indiana Music Educators Association |
| IMFA | International Molded Fiber Association |
| IMFA | International Molyneux Family Association |
| IMFA | Islington Managua Friendship Association |