| Acronym | Definition |
|---|
| ISIM➣IMS (IP Multimedia Subsystem) Subscriber Identity Module |
| ISIM➣International Institute for the Study of Islam in the Modern World |
| ISIM➣Institute for the Study of International Migration |
| ISIM➣Integrated Science Instrument Module (James Webb Space Telescope) |
| ISIM➣International Society for Improvised Music (Ann Arbor, MI) |
| ISIM➣International Society of Internal Medicine (founded in 1948) |
| ISIM➣International Symposium on Induced Mutations in Plants (International Atomic Energy Agency) |
| ISIM➣Interlinking Statistical Information |