| Acronym | Definition |
|---|
| ITSO | International Technical Support Organization (IBM) |
| ITSO | International Technical Support Organization |
| ITSO | International Telecommunications Satellite Organization |
| ITSO | Integrated Transport Smartcard Organisation (UK) |
| ITSO | Information Technology Security Officer |
| ITSO | Information Technology Student Organization |
| ITSO | Incoming Trunk Service Observation |
| ITSO | Information Technology Solution Optimizer (Columbia Information Systems) |
| ITSO | Information Technology Service Optimization (TeamQuest Corporation) |
| ITSO | Information Technology Systems and Operations (various locations) |
| ITSO | Information Technology Security Operations |