5,411 titles
| Cinema | 1924-1948 | Bucharest, Romania |
| A Cipőgyártó | 1934-1938 | Budapest, Hungary |
| Cipőszemle | 1934-1938 | Budapest, Hungary |
| CL et CL | 1963-1982 | Budapest, Hungary |
| Clopotul | 1949-1987 | Botoșani, Romania |
| Codices Hungarici | 1944-1944 | Budapest, Hungary |
| Codrul Cosminului | 1924-1935 | Chernivtsi, Ukraine |
| Comertul Modern | 1972-1980 | Bucharest, Romania |
| Comitatus | 1991-2021 | Veszprém, Hungary |
| Commentarii exegetici ad Scriptores Graecos et Romanos | Books | |
| Communicationes Archaeologicae Hungariae | 1981-2013 | Budapest, Hungary |
| COMPLEX | 1992-2005 | Budapest, Hungary |
| Concordia | 1861-1867 | Budapest, Hungary |
| Confessio | 1977-2011 | Budapest, Hungary |
| Construcția de Maşini | 1963-1990 | Bucharest, Romania |
| Construcţii | 1950-1973 | Bucharest, Romania |
| Constructorul | 1950-1973 | Bucharest, Romania |
| Contemporanul | 1948-2020 | Bucharest, Romania |
| Convieţuirea | 1997-2018 | Szeged, Hungary |
| Convorbiri Literare | 1868-1944 | Bucharest, Romania |
