| Acronym | Definition |
|---|
| ISMA | International Stress Management Association (UK) |
| ISMA | International Securities Market Association |
| ISMA | Idle Sense Multiple Access |
| ISMA | Internet Streaming Media Alliance |
| ISMA | International Sports Medicine Association |
| ISMA | Inhibit Sense Multiple Access (Transmission Protocol) |
| ISMA | International Ship Managers Association |
| ISMA | International Symposium on Mechatronics and its Applications (IEEE) |
| ISMA | International Snowmobile Manufacturer's Association |
| ISMA | International Ship Masters' Association |
| ISMA | ISC Management Activity |
| ISMA | Insurance Marketplace Standards Association |
| ISMA | Improved Satellite Multi-Channel Antenna |
| ISMA | Information Systems Management Activity/Agency |
| ISMA | Integrated Service Management Architecture (Sprint) |