ITSO may refer to:
- ITSO Ltd, previously Integrated Transport Smartcard Organisation, who maintain the ITSO standard for smart ticketing in the UK
- International Telecommunications Satellite Organization, an intergovernmental consortium
- Information Technology Student Organization, a student organization at Rochester Institute of Technology
- International Technical Support Organization, the IBM group that produces IBM Redbooks.
This disambiguation page lists articles associated with the title ITSO.
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