IMSB
| 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) |