| Acronym | Definition |
|---|
| IMPA | Instituto Nacional de Matemática Pura e Aplicada (Brazil) |
| IMPA | International Maritime Pilots' Association |
| IMPA | Indiana Municipal Power Agency |
| IMPA | International Marine Purchasing Association |
| IMPA | International Motor Press Association |
| IMPA | Intelligent Multi-Port Adapter |
| IMPA | Internet Mission Photography Archive |
| IMPA | Internet Media Protective Association (Lake Elsinore, CA) |
| IMPA | Iowa Motion Picture Association |
| IMPA | International Music Publishers' Association |
| IMPA | Individual Market Participant Analysis |
| IMPA | International Myopia Prevention Association (Ligonier, Pennsylvania) |
| IMPA | Isopropyl Methyl Phosphonic Acid |
| IMPA | Institut de Morphopsychologie Appliquée |
| IMPA | Independent Medical Practitioners Association |
| IMPA | Immune Mediated Polyarthritis |
| IMPA | Indian Motion Pictures Association |
| IMPA | International Music Products Association |
| IMPA | Illinois Milk Producers' Association (Bloomington, IL) |
| IMPA | Idaho Milk Processors Association |
| IMPA | Indo-Malay Philippines Archipelago |
| IMPA | International Master Printers Association |
| IMPA | Imperial Parrot (Amazona imperialis) |
| IMPA | Iowa Meat Processors Association |
| IMPA | Independent Meeting Planner |
| IMPA | Independent Market Participant Analysis |
| IMPA | Lower Incisor to Mandibular Plane |
| IMPA | Internet Media Publishers Association |
| IMPA | Ion Microprobe Analysis |
| IMPA | Internet Media Publishing Associates |
| IMPA | IMPulse Array |
| IMPA | Internal Medicine for Physicians Assistant |
| IMPA | International Motion Picture Almanac |
| IMPA | Isopropylmethyl Phosphonic Acid |
| IMPA | International Marketing Promotion Alliance |
| IMPA | Industry Mentor-Protege Association |
| IMPA | Independent Music Producers Association |
| IMPA | International Milk Producers Association (Arlington, VA) |
| IMPA | Internal Medicine & Pediatric Associates |
| iMPA | Iterative Message Passing Algorithm |