| Acronym | Definition |
|---|
| IMSB➣Intelligent Mail Small Business (software) |
| IMSB➣I Am So Bored (Internet slang) |
| IMSB➣Insight Meditation South Bay (California) |
| IMSB➣Information Management Services Branch |
| IMSB➣Institute of Membrane and Systems Biology (Faculty of Biological Studies; University of Leeds; UK) |
| IMSB➣Ice and Marine Services Branch |
| IMSB➣Improving Medical Support to a Brigade (UK Army Medical Doctrine) |