| Acronym | Definition |
|---|
| CSIS➣Canadian Security Intelligence Service |
| CSIS➣Center for Strategic & International Studies |
| CSIS➣Computer Science and Information Systems |
| CSIS➣Center for Spatial Information Science (University of Tokyo; Japan) |
| CSIS➣Commercial Sex Information Service |
| CSIS➣California School Information Services |
| CSIS➣Center for Secure Information Systems |
| CSIS➣College des Sciences de l'Ingenierie et des Systèmes (French: College of Engineering and Systems Sciences; Paris-Saclay University; Paris, France) |
| CSIS➣Container Shipping Information Service (public awareness initiative) |
| CSIS➣Canadian Society for Industrial Security, Inc. |
| CSIS➣Civil Service Insurance Society (United Kingdom) |
| CSIS➣Canadian Society for Italian Studies |
| CSIS➣Case-Shiller Indexes |
| CSIS➣Complete Sentient Information Systems (Canada) |
| CSIS➣Customer Service Inquiry System |
| CSIS➣Credited Structures Inventory System (US FEMA) |
| CSIS➣Centre for Strategic Information Systems |
| CSIS➣Community Safety Information System |
| CSIS➣Citigroup Security and Investigative Services |
| CSIS➣Customer Service Information System |
| CSIS➣Central Secondary Item Stratification |
| CSIS➣College Student Insurance Service |
| CSIS➣China's Species Information System |
| CSIS➣Children's Services Information Service |
| CSIS➣Center for Study of Intimate Systems |
| CSIS➣Coping Strategies Inventory for Statistics |
| CSIS➣Combined Spectral Interpolation Synthesis |
| CSIS➣Collectible Specialties Import Services |
| CSIS➣Constituent Services Information System (Georgia) |
| CSIS➣Council of Senior Islamic Scholars (Saudi Arabia) |