| Abbreviation | Definition |
|---|---|
| ITR | Internet Telephone Router |
| ITRC | Iran Telecom Research Center |
| ITRC | Iran Telecommunication Research Center |
| ITS | Institute for Telecommunication Sciences |
| ITSO | International Telecommunications Satellite Organization |
| ITST | Intelligent Transport Systems Telecommunications |
| ITTC | Information and Telecommunication Technology Center |
| ITTP | Information Technology And Telecommunications Policy |
| ITTP | Internet Telephony Transport Protocol |
| ITU | Indian Telecom Unions |
| ITU | International Telecommunication Union |
| ITU | International Telecommunications Union |
| ITU | International Telecomunications Union |
| ITUT | International Telecommunication Union - Telecommunication Standardization Sector (usually seen as IT |
| ITUT | ITU- Telecommunication Standardization Sector |
| ITU-T | International Telecommunication Union - Telecommunications section |
| ITU-TSS | International Telecommunications Union - Telecommunications Standardization Sector |
| ITV | Instructional Telecommunications And Video |
| ITW | International Telecoms Week |
| IU | Internal Use |