| Abbreviation | Definition |
|---|---|
| IMPA | Indian Medical Professional Association |
| IMPA | Instrumental Music Parents Association |
| IMPA | International Marine Purchasing Association |
| IMPA | International Maritime Pilots Association |
| IMPA | International Maritime Pilots' Association |
| IMPA | International Motor Press Association |
| IMPA | Iowa Meat Processors Association |
| IMPA | Iowa Motion Picture Association |
| IMPALA | Independent Music Publishers and Labels Association |
| IMRA | Irish Mountain Running Association |
| IMRA | Italian Mixed Reality Association |
| IMSAC | Independent Massage School Association of California |
| IMSIA | International Mermaid Swimming Instructors Association |
| IMTA | Illinois Municipal Treasurers Association |
| IMTA | Indiana Motor Truck Association |
| IMTA | International Modeling and Talent Association |
| IMTA | Iowa Motor Truck Association |
| IMVA | International Medical Veritas Association |
| IMVA | International Medical Volunteers Association |
| IMZA | International Miniature Zebu Association |