| ITSO | Illinois Taekwondo State Organization 
| Others |
| ITSO | Incoming Trunk Service Observation
| Others |
| ITSO | Information Technology Security Office
| Others |
| ITSO | Information Technology Services Office
| Others |
| ITSO | Information Technology Student Organization
| Others |
| ITSO | Innovation and Technology Support Office
| Others |
| ITSO | Instructional Technology Services Organization (Lewis University)
| Others |
| ITSO | Instructional Technology Support Office
| Others |
| ITSO | Integrated Through Screen Optics
| Others |
| ITSO | Integrated Transport Smartcard Organisation
| Others |
| ITSO | Interdisciplinary Transportation Student Organization
| Others |
| ITSO | International Technical Support Organization
| Others |
| ITSO | International Telecommunications Satellite Organization
| Others |
| ITSO | International Trade Strategy and Operations
| Others |