| CI&I | Compatibility, Interoperability, and Integration 
| Others |
| CII | California Identification Index
| Others |
| CII | Call Identity Index
| Others |
| CII | Capital Inflation Index
| Others |
| CII | Cardiovascular Innovation Institute
| Others |
| CII | Celebrations India, Inc.
| Others |
| CII | Center for Identity Inclusion
| Others |
| CII | Center for Infection and Immunity
| Others |
| CII | Centre for Immunology and Infection
| Others |
| CII | Certificate in Insurance
| Others |
| CII | Chartered Insurance Institute
| Others |
| CII | Chemical Input Instruction
| Others |
| CII | Chidambaram's India, Inc.
| Others |
| CII | Children's Institute International
| Others |
| CII | Church In Indianapolis
| Others |
| CII | Coady International Institute
| Others |
| CII | Commercial Industrial Institutional
| Others |
| CII | Common Interworking Indicator
| Others |
| CII | Communication Integrators Inc
| Others |
| CII | Compassion International Incorporated
| Others |
| CII | Compressed Inverted Index
| Others |
| CII | Computer Implemented Invention
| Others |
| CII | Confederation of Indian Industries
| Others |
| CII | Confederation of Indian Industry
| Organization |
| CII | Conference interpreters international
| Others |
| CII | Configuration Identification Index
| Others |
| CII | Configuration Item Identification
| Others |
| CII | Construction Industry Institute
| Others |
| CII | Continuous Improvement and Innovation
| Others |
| CII | Control Input Interface
| Others |
| CII | Core Infrastructure Initiative
| Others |
| CII | Cost Inflation Index
| Economics, Finance |
| CII | Cost inflation index
| Others |
| CII | Council of Institutional Investors
| Others |
| CII | Council of International Investigators
| Others |
| CII | Council of Islamic Ideology
| Others |
| CII | Current Impact Index
| Others |
| CII | Cybernetic Industries Incorporated
| Others |
| CII | The Center For Industrial Innovation
| Others |