CII
- 102 (number)
- C2 (disambiguation)
- Calculated Ignition Index
- Caldera International, Inc.
- Centro Intelligence Interforze
- Chartered Insurance Institute
- Children's Institute International
- Colour Index International
- Coláiste Íde agus Iosef
- Compagnie internationale pour l'informatique
- Confederation of Indian Industry
- Construction Industry Institute
- Core Infrastructure Initiative
- Council of Islamic Ideology
- France 24
- George M. Low Center for Industrial Innovation
- UN/CEFACT