| Abbreviation | Definition |
|---|---|
| ILYA | Inter Lake Yachting Association |
| IMA | Idaho Medical Association |
| IMA | Illinois Manufacturers' Association |
| IMA | Industrial Minerals Association |
| IMA | International Magnesium Association |
| IMA | International Microsimulation Association |
| IMA | International Mineralogical Association |
| IMAA | Indian Mills Athletic Association |
| IMAA | Indiana Mineral Aggregates Association |
| IMAA | Interactive Marketing Association Alliance |
| IMAA | Intercultural Mutual Assistance Association |
| IMAB | International Medical Association Bulgaria |
| IMAI | Internet Mobile Association Of India |
| IMAJ | Incorporated Masterbuilders Association of Jamaica |
| IMAM | Mahdi Association of Marjaeya |
| IMAN | Islamic Medical Association of Nigeria |
| IMANI | Islamic Medical Association and Network of Indonesia |
| IMAS | Investment Management Association of Singapore |
| IMASA | Independent Martial Art Sports Association |
| IMASA | Irish Mission Adventist Students Association |