| Abbreviation | Definition |
|---|---|
| CISMO | Clearing Integrated Services & Market Operations GmbH |
| CISP | Cambridge International Science Publishing |
| CISP | Commercial Internet Service Provider |
| CISR | Cult Information Service of Rochester |
| CISV | Catalog Information Systems Vendor |
| CIT | Cambridge Information Technology |
| CIT | Compagnia Italiana Turismo |
| CIT | Cornell Information Technologies |
| CITC | Canadian Innovations Technology Corporation |
| CITC | Canadian Innovations & Technology Corporation |
| CITC | Cook Islands Trading Corporation |
| CITC | Crawford International Theatrical Corporation |
| CITIC | China International Trust and Investment Corporation |
| CITIC | China International Trust Investment Corporation |
| CITICS | China International Trust Investment Corporation Securities |
| CITS | Canon Information Technology Services |
| CITS | Chinese International Travel Service |
| CIVC | Canadian Imperial Venture Corp |
| CIVC | Continental Illinois Venture Corporation |
| CIWTC | Central Inland Water Transport Corporation Limited |