| Acronym | Definition |
|---|
| CII | Conseil International des Infirmières (French: International Council of Nurses; Switzerland) |
| CII | Commercial, Industrial & Institutional |
| CII | Critical Illness Insurance |
| CII | Centre d'Information Internationale (French: International Information Center) |
| CII | Conference Interpreters International (Brussels, Belgium) |
| CII | Certificat Informatique et Internet (French: Computer and Internet Certificate) |
| CII | Compatibility, Interoperability, and Integration |
| CII | Calculated Ignition Index |
| CII | Common Integrated Infrastructure |
| CII | Conseil Investissement Immobilier (French: Investment Real Estate Council) |
| CII | Computer-Integrated Instruction |
| CII | Configuration Item Index |
| CII | Chemistry International Instrument |
| CII | Compatibility, Integration, and Interoperability |
| CII | Criminal Investigation Index |
| CII | Criminal Information Index |
| CII | Cleveland Industries Inc. |
| CII | Configuration Identification/Item Index |
| CII | Configuration Item Identification |
| CII | Connecticut Innovations, Inc. |
| CII | Chartered Insurance Institute (UK) |
| CII | CaseWare IDEA, Inc. (various locations) |
| CII | Construction Industry Institute (University of Texas) |
| CII | Counter Iranian Influence |
| CII | Critical Infrastructure Information |
| CII | Central Intelligence Institute (fictional agency) |
| CII | Centre for International Intervention (UK) |
| CII | Schedule II Controlled Substance (USA) |
| CII | Confederation of Indian Industry |
| CII | Computer Intrusion Incident |
| CII | Council on International Initiatives (Missouri) |
| CII | Communications and Information Industries |
| CII | Critical Information Infrastructures |
| CII | Collective Investment Institutions (various locations) |
| CII | Children's Institute International |
| CII | Council of Institutional Investors |
| CII | Center for International Initiatives (American Council on Education) |
| CII | Cornerstone Industry, Inc. |