| 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 |