| Acronym | Definition |
|---|
| ISMS | Information Security Management System |
| ISMS | Illinois State Medical Society |
| ISMS | Integrated Safety Management System |
| ISMS | Information Security Management Systems |
| ISMS | International Symposium on Molecular Spectroscopy |
| ISMS | In-flight Safety Monitoring System |
| ISMS | International Seminar on Manufacturing Systems |
| ISMS | Indian Society for Medical Statistics |
| ISMS | Integrated Ship Management System (various locations) |
| ISMS | Illinois State Museum Society |
| ISMS | Integrated Environmental, Safety, and Health Management System |
| ISMS | Integrated Survivability Management System (NAVSEA) |
| ISMS | International School of Medical Sciences (Panama) |
| ISMS | International Society of Military Sciences (The Netherlands) |