| CIIS | California Institute of Integral Studies 
| Others |
| CIIS | Canon Information and Imaging Solutions
| Others |
| CIIS | Cardiac Infarction Injury Score
| Others |
| CIIS | Center for Implementation and Improvement Sciences
| Others |
| CIIS | Center for Integrated Intelligence Systems
| Others |
| CIIS | China Institute of International Studies
| Others |
| CIIS | College of Innovation and Industry Skills
| Others |
| CIIS | Colorado Immunization Information System
| Others |
| CIIS | Community Investment Impact System
| Others |
| CIIS | Comprehensive-Interactive Information Strategy
| Others |
| CIIS | Computer Institute In Slemani
| Others |
| CIIS | Computer Integrated Interventional Systems
| Others |
| CIIS | Continental Institute of International Studies
| Others |