| ISMS | Illinois State Medical Society 
| Others |
| ISMS | In Search of My Self
| Others |
| ISMS | Indian School of Management Studies
| Others |
| ISMS | Indian Society for Medical Statistics
| Others |
| ISMS | Indian Springs Middle School
| Others |
| ISMS | Information Security Management System
| Others |
| ISMS | Information Security Management Systems
| Others |
| ISMS | INFORMS Society for Marketing Science
| Others |
| ISMS | Inner Sydney Montessori School
| Others |
| ISMS | Institute Student Management System
| Others |
| ISMS | Institution of Silly and Meaningless Sayings
| Others |
| ISMS | Institution of Silly Meaningless Sayings
| Others |
| ISMS | Integrated Safety Management System
| Others |
| ISMS | Integrated Security Model For Snmp
| Others |
| ISMS | Integrated Service Management System
| Others |
| ISMS | Integrated Ship Management System
| Others |
| ISMS | Intelligent Short Message Service
| Others |
| ISMS | Intelligent Sound And Music Systems
| Others |
| ISMS | International School of Medical Sciences
| Others |
| ISMS | International Slot Machine Sales
| Others |
| ISMS | International Society For Mushroom Science
| Others |
| ISMS | International Society of Military Sciences
| Others |
| ISMS | International Strategic Marketing Services
| Others |
| ISMS | International Surgical Mission Support
| Others |
| ISMS | International Symposium on Molecular Spectroscopy
| Others |
| ISMS | Isaac L Sowers Middle School
| Others |
| ISMS | Isaac Sowers Middle School
| Others |