| Acronym | Definition |
|---|
| CIDR | Classless Inter-Domain Routing |
| CIDR | Classless Internet Domain Routing |
| CIDR | Centre International de Développement et de Recherche (French: International Center for Research and Development; France) |
| CIDR | Center for Instructional Development and Research (University of Washington) |
| CIDR | Center for Inherited Disease Research |
| CIDR | Controlled Internal Drug Release (device) |
| CIDR | Cellular Immunotherapy Data Resource (oncology) |
| CIDR | Critical Intermediate Design Review |
| CIDR | County Issuance Decal/Registration (South Carolina) |