| Abbreviation | Definition |
|---|---|
| CRCCritRevToxicol | CRC Critical Reviews in Toxicology |
| CRDL | Civil Rights Digital Library |
| CRIS | Current Research Information Systems |
| CRISP | Computer Retrieval of Information on Scientific Projects |
| CRL | C Region Library |
| CRL | Center for Research Libraries |
| CRL | Code Replacement Library |
| CRL | Costume Reference Library |
| CRLD | College Research Libraries Division |
| CRLD | Crick Resource Library Data |
| CRLS | Cherokee Regional Library System |
| CRLS | Chestatee Regional Library System |
| CRLS | Conyers-Rockdale Library System |
| CRMBL | Cooper River Memorial Branch Library (Charleston, SC) |
| CRP | Centre de Recherche Public |
| CRPL | Cedar Rapids Public Library |
| CSALT | Collocation Stand Alone Library and Toolkit |
| CSDL | Center for the Study of Digital Libraries |
| CSDL | Computer Society Digital Library |
| CSFG | Canberra Speculative Fiction Guild |