| Abbreviation | Definition |
|---|---|
| CTPL | Clinton Township Public Library |
| CTR | Transaction Technology, Inc., Technical Library |
| CTTL | Common Text Transformation Library |
| CUAL | Connacht Ulster Alliance Libraries |
| CUL | Cambridge University Library |
| CUL | Central University Libraries |
| CUL | Columbia University Libraries |
| CUL | Cornell University Library |
| CULS | College and University Libraries Section |
| CURL | Client for URL Resource Library |
| CUWL | Council of University of Wisconsin Libraries |
| CV | Collected Volumes |
| CVL | Cognex Vision Library |
| CWBL | Coloma Way Branch Library |
| CWHM | Current Work in the History of Medicine |
| CWL | Central West Libraries |
| CzechMedJ | Czechoslovakian Medical Journal |
| DAB | Dictionary of American Biography |
| DACB | Dictionary of African Christian Biography |
| DACL | Dynamic Automation Control Libraries |