| ISMA | Idle Sense Multiple Access 
| Others |
| ISMA | Indian Summer Music Awards
| Others |
| ISMA | Indiana State Medical Association
| Others |
| ISMA | Information Systems Management Activity
| Others |
| ISMA | Information Systems Management Architecture
| Others |
| ISMA | Inhibit Sense Multiple Access
| Others |
| ISMA | International Seal Manufacturers Association
| Others |
| ISMA | International Securities Market Association
| Others |
| ISMA | International Security Management Association
| Others |
| ISMA | International Security Managers Association
| Others |
| ISMA | International Snowmobile Manufacturers Association
| Others |
| ISMA | International Social Marketing Association
| Others |
| ISMA | International Social Media Association
| Others |
| ISMA | International Space Monkey Alliance
| Others |
| ISMA | International Stress Management Association
| Others |
| ISMA | International Students Meetingpoint Amsterdam
| Others |
| ISMA | International Super Modified Association
| Others |
| ISMA | Internet Statistics and Metrics Analysis
| Others |
| ISMA | Internet Streaming Media Alliance
| Others |
| ISMA | Introductory Subject Matter Authorization
| Others |
| ISMA | Iso Mpeg4 Advanced
| Others |