| CIRIS | California Inter Regional Intermodal System 
| Others |
| CIRIS | Cambridge Institute on Religion and International Studies
| Others |
| CIRIS | Cayman Islands Regulatory Intelligence System
| Others |
| CIRIS | Center for International Relations and International Security
| Others |
| CIRIS | City Inventory Reporting and Information System
| Others |
| CIRIS | Compact Infrared Radiometer In Space
| Others |
| CIRIS | Complete Integrated Reference Instituteumentation System
| Others |
| CIRIS | Completely Integrated Reference Instrumentation
| Others |
| CIRIS | Completely Integrated Reference Instrumentation System
| Others |
| CIRIS | Continuous Improvement in Regulated Industries and Services
| Others |
| CIRIS | Critical Infrastructure Response Information System
| Others |
| CIRIS | Customer Insurance and Registration Information Support
| Others |