| Classical Philology | | 0009-837X |
| Classical Quarterly | | 0009-8388 |
| Classical Receptions Journal | CLASSICAL RECEPTIONS JOURNAL | 1759-5134 |
| Classical Review | | 0009-840X |
| Classical World | CLASSICAL WORLD | 0009-8418 |
| Classiconorroena | | 1071-4405 |
| Classics Ireland | | 0791-9417 |
| Classroom Discourse | CLASSROOM DISCOURSE | 1946-3014 |
| Clay Minerals | CLAY MINER | 0009-8558 |
| Clay Research | CLAY RESEARCH | 0255-7193 |
| Clays and Clay Minerals | CLAY CLAY MINER | 0009-8604 |
| CLCWEB-Comparative Literature and Culture | | 1481-4374 |
| Clean Air and Containment Review | CLEAN AIR AND CONTAINMENT REVIEW | 2042-3268 |
| Clean Air Journal | CLEAN AIR JOURNAL | 1017-1703 |
| Clean Energy | CLEAN ENERGY | 2515-4230 |
| Clean Technologies and Environmental Policy | CLEAN TECHNOL ENVIR | 1618-954X |
| CLEAN-Soil Air Water | CLEAN-SOIL AIR WATER | 1863-0650 |
| Cleft Palate-Craniofacial Journal | CLEFT PALATE-CRAN J | 1055-6656 |
| Cleft Palate-Craniofacial Journal | CLEFT PALATE-CRAN J | 1545-1569 |
| Clepsidra. Revista Interdisciplinaria de Estudios sobre Memoria | CLEPSIDRA. REVISTA INTERDISCIPLINARIA DE ESTUDIOS SOBRE MEMORIA | 2362-2075 |
| Cleveland Clinic Journal of Medicine | CLEV CLIN J MED | 0891-1150 |
| Cleveland state law review | CLEVELAND STATE LAW REVIEW | 0009-8876 |
| Cleveland Studies in the History of Art | | 1092-3934 |
| Climacteric | CLIMACTERIC | 1369-7137 |
| Climate | CLIMATE | 2225-1154 |
| Climate and Development | CLIM DEV | 1756-5529 |
| Climate Change Economics | CLIMATE CHANGE ECONOMICS | 2010-0078 |
| Climate Dynamics | CLIM DYNAM | 0930-7575 |
| Climate Law | CLIMATE LAW | 1878-6553 |
| Climate of the Past | CLIM PAST | 1814-9324 |
| Climate Policy | CLIM POLICY | 1469-3062 |
| Climate Research | CLIM RES | 0936-577X |
| Climate Risk Management | CLIMATE RISK MANAGEMENT | 2212-0963 |
| Climate Services | CLIMATE SERVICES | 2405-8807 |
| Climatic Change | CLIMATIC CHANGE | 0165-0009 |
| Climatologia e Estudos da Paisagem | CLIMATOLOGIA E ESTUDOS DA PAISAGEM | 1980-654X |
| Clinica Chimica Acta | CLIN CHIM ACTA | 0009-8981 |
| Clinica e Investigacion en Arteriosclerosis | CLINICA E INVESTIGACION EN ARTERIOSCLEROSIS | 0214-9168 |
| Clinica e Investigacion en Ginecologia y Obstetricia | CLINICA E INVESTIGACION EN GINECOLOGIA Y OBSTETRICIA | 0210-573X |
| Clinica Terapeutica | CLIN TER | 0009-9074 |
| Clinica Veterinaria de Pequenos Animales | CLIN VET PEQUENOS AN | 1130-7064 |
| Clinica y Salud | CLINICA Y SALUD | 1130-5274 |
| Clinical & Developmental Immunology | CLIN DEV IMMUNOL | 1740-2522 |
| Clinical and Experimental Metastasis | CLIN EXP METASTAS | 0262-0898 |
| Clinical & Translational Immunology | CLINICAL & TRANSLATIONAL IMMUNOLOGY | 2050-0068 |
| Clinical & Translational Oncology | CLIN TRANSL ONCOL | 1699-048X |
| Clinical Advances in Hematology & Oncology | CLINICAL ADVANCES IN HEMATOLOGY & ONCOLOGY | 1543-0790 |
| Clinical Advances in Periodontics | CLINICAL ADVANCES IN PERIODONTICS | 2163-0097 |
| Clinical Anatomy | CLIN ANAT | 0897-3806 |
| Clinical and Applied Thrombosis/Hemostasis | CLIN APPL THROMB-HEM | 1076-0296 |
