| Abbreviation | Definition |
|---|---|
| IMAPS | International Microelectronic Assembly and Packaging Society |
| IMAPS | International Microelectronics Assembly and Packaging Society |
| IMAS | Idaho Marine Aquarium Society |
| IMAS | Iraqi Mutual Aid Society |
| IMAS | Islands Medical Assistance Society |
| IMC | Institute of Measurement and Control of New Zealand |
| IMCS | International Membrane Computing Society |
| IMdFS | International Marie de France Society |
| IMechE | Institution of Mechanical Engineers |
| IMEKO | International Measurement Confederation |
| IMHS | Indian Military Historical Society |
| IMIQ | Instituto Méxicano de Ingenieros Químicos |
| IMIQ | Instituto Mxicano de Ingenieros Qumicos |
| IMIQ | Mexican Institute of Chemical Engineers |
| IMMA | International Marine Mammal Association |
| IMMS | International Marine Minerals Society |
| IMOS | Illinois Medical Oncology Society |
| IMS | Insight Meditation Society |
| IMS | International Musicological Society |
| IMS | Internationale Gesellschaft fr Musikwissenschaft |