| C19, the Nineteenth Century Index (1770-1919) | |
| Cabell's Directories of Publishing Opportunities, Educational Set | |
| Call and Post (1934-1991) | |
| Canadian Poetry (1667-1930) | |
| Cancer Prevention Journals Portal | |
| Charleston advisor | |
| Chemical Abstracts (1907-) | |
| Chicago defender (1909-1975) | |
| Chicago Tribune (1849-1986) | |
| Chicano Database (1960-) | |
| Children's Literature Comprehensive Database | |
| Children's Literature Review | |
| China Academic Journals (1994-) | |
| Choice Reviews Online (1987-) | |
| Christian Science Monitor (1908-1996) | |
| CINAHL Plus with Full Text (1937-) | |
| Civil War Era (1840-1865) | |
| Civil War, a Newspaper Perspective (1860-1865) | |
| ClasePeriodica (CLASE 1975-, Periodica 1978-) | |
| Classical Music Library | |
| Classical Music Reference Library | |
| Classical Scores Library | |
| Clinical Pharmacology (1953-) | |
| CollegeSource (1994-) | |
| Colonial State Papers (1574-1757) | |
| Communication & Mass Media Complete (1915-) | |
| Compendex (1884-) | |
| Computer Source (1965-) | |
| Computers & Applied Sciences Complete | |
| Conference Proceedings Citation Index - Science (1990-) | |
| Conference Proceedings Citation Index - Social Science & Humanities (1990-) | |
| Congressional Hearings and Committee Prints | |
| Congressional Staff Directory | |
| Congressional Universe (1789-) | |
| Connect Complete (1988-) | |
| Consumer Health Complete (1930-) | |
| Contemporary Authors | |
| Contemporary Literary Criticism Select | |
| Contemporary World Music | |
| Counseling and Psychotherapy Transcripts, Client Narratives, and Reference Works | |
| Counseling and Therapy in Video | |
| CountryWatch | |
| CQ Global Researcher (2007-) | |
| CQ Public Affairs Collection | |
| CQ Researcher Plus Archive (1923-) | |
| CQ Voting and Elections Collection (1789-) | |
| CRC Handbook of Chemistry and Physics | |
| CRCnetBASE | |
