| Abbreviation | Definition |
|---|---|
| ISIS | International Society on Infant Studies |
| ISIS | International Spine Intervention Society |
| ISJ | Ichthyological Society of Japan |
| ISKO | International Society for Knowledge Organization |
| ISL | International Society of Lymphology |
| ISLAM | International Society for Laser Application In Medicine |
| ISLD | International Society for Lasers in Dentistry |
| ISLS | International Society of the Learning Sciences |
| ISM | Incorporated Society of |
| ISM | Institution of Surveyors, Malaysia |
| ISM | Islamic Society of Milwaukee |
| ISM | Pertubuhan Juruukur Malaysia |
| ISMAS | Indian Society for Mass Spectrometry |
| ISMCS | International Sewing Machine Collectors' Society |
| ISMCS | International Society for Mechanical Circulatory Support |
| ISMD | International Society of Markets and Development |
| ISME | Indian Society of Mechanical Engineers |
| ISME | International Society for MacIntyrean Enquiry |
| ISME | International Society for Mangrove Ecosystems |
| ISME | International Society for Military Ethics |