| Acronym | Definition |
|---|
| CNI | Centro Nacional de Inteligencia (Madrid, Spain) |
| CNI | Centre National de l'Informatique (French: National Informatics Center; Tunisia) |
| CNI | Confederação Nacional da Indústria (Brazil) |
| CNI | Calcineurin Inhibitor |
| CNI | Coalition for Networked Information |
| CNI | Critical National Infrastructure |
| CNI | Certificate of No Impediment (marriages abroad) |
| CNI | Carte Nationale d'Identité (French: National Identity Card) |
| CNI | Care of Nonce Index |
| CNI | Change Number Intercept |
| CNI | Calling Name Identification |
| CNI | Ceský Normalizacní Institut (Czech: Czech Standards Institute) |
| CNI | Certified Novell Instructor |
| CNI | Comic News Insider |
| CNI | Corporate Net Income (taxes) |
| CNI | Congreso Nacional Indígena (Spanish: Indian National Congress) |
| CNI | Carbon Nanotechnologies, Inc. (now Unidym; Menlo Park, CA) |
| CNI | Calling Number Identification |
| CNI | Common Network Interface |
| CNI | Central Nacional de Informaciones (Spanish: National Information Center; Chile) |
| CNI | Contribution to Net Income |
| CNI | Construction of New Infrastructure (various locations) |
| CNI | Culture Northern Ireland (UK) |
| CNI | Chickasaw Nation Industries, Inc. (Norman, OK) |
| CNI | Community Nutrition Institute |
| CNI | Central Newspapers, Inc. (various locations) |
| CNI | Center for Cognitive and Neurobiological Imaging (Stanford University) |
| CNI | Commander Naval Installations |
| CNI | Central Nacional de Inteligencia (Chile) |
| CNI | Certified NetWare Instructor |
| CNI | Computing and Networking Infrastructure (various organizations) |
| CNI | Children's Nature Institute (Beverly Hills, CA) |
| CNI | Computer News and Information (Internet radio station) |
| CNI | Cash Net Income (accounting) |
| CNI | Communication, Navigation & Identification ( avionics system in advanced military fighters) |
| CNI | Caregiver Network Inc. (Canada) |
| CNI | Century-National Insurance (various locations) |
| CNI | Coordination Nationale Infirmière |
| CNI | Center for Networked Information |
| CNI | National Ittihadi Congress Party (Morocco) |
| CNI | Citizens Committee for Nuclear Information |
| CNI | Community Networks, Inc. |
| CNI | Chemical News and Intelligence (industry database) |
| CNI | Carbon Neutral Initiative (various locations) |
| CNI | Country and Network Identification |
| CNI | Changed Number Interception |
| CNI | Coalition Network Initiative |
| CNI | Centralized Noise Injection |
| CNI | Customer Network Implementation |
| CNI | Consolidated Networks Incorporated |
| CNI | Cable Network Incorporated |
| CNI | Communications Network Interface, Inc. (Korea) |