| Coeur de lune | France | 4 |
| Coffee house press | Etats-Unis | 14 |
| Cogitare | France | 5 |
| Cogito | France | 8 |
| Cogito Ergo Sum | France | 15 |
| Cohen&Cohen | France | 11 |
| Coiffard librairie | France | 2 |
| Colbo | France | 2 |
| Colibri | Bulgarie | 1 |
| Colihue | France | 1 |
| Collection livres | France | 11 |
| Collection Poche | France | 10 |
| Collection Pourpre | France | 21 |
| Collection Proche | France | 40 |
| Collection XIX | France | 5 |
| Collector's Guide Publishing | France | 2 |
| Collector's Library | Angleterre | 41 |
| Collège de France | France | 7 |
| Collège de France / Fayard | France | 9 |
| Collège international de philosophie | France | 1 |
| Collier Book | France | 3 |
| Collins & Brown | Angleterre | 23 |
| Colombia University Press | France | 4 |
| Colonna | France | 1 |
| Colorama | France | 1 |
| Colruyt | Belgique | 17 |
| Coltso | | 1 |
| Columbia University Press | Etats-Unis | 27 |
| Comédia | France | 8 |
| Comex | France | 2 |
| Comics USA | France | 26 |
| Comité des travaux historiques et scientifiques (CTHS) | France | 4 |
| Comix Buro | France | 42 |
| Comixland | France | 1 |
| ComiXology | Etats-Unis | 12 |
| Comma Press | Angleterre | 5 |
| CommaC Productions | France | 1 |
| Comme des géants | Canada | 10 |
| Comme un lézard | France | 1 |
| Comme une orange | | 4 |
| Commission européenne | France | 2 |
| Commonwealth Publishing | | 1 |
| Communard.e.s | France | 2 |
| Communicare | France | 2 |
| Communication simple | Canada | 1 |
| Communication-Presse | France | 2 |
| Community | Allemagne | 3 |
| Comp'Act | France | 2 |
| Compagnie 12 | France | 1 |
| Compagnie des libraires | France | 1 |
| Compagnie du Savoir | France | 55 |
| Companhia das Letrinhas | Brésil | 5 |
| Compatta | Italie | 2 |
| Complexe | France | 84 |
| Complices | France | 8 |
| Complicités | France | 20 |
| Comptoir du Livre | France | 6 |
| Confluences | France | 9 |
| Connaissance des Arts | France | 20 |
| Connaissances et savoirs | France | 4 |
| Connaître Chott | France | 10 |
| Connivences | | 2 |
| Conséquences | France | 7 |
| Console Syndrome | France | 1 |
| Conspiration | France | 4 |
| Constable | Angleterre | 83 |
| Constellations | France | 2 |
| Contemporaines | France | 4 |
| Contemporary Books | France | 4 |
| Conti | France | 3 |
| Continents | Togo | 2 |
| Continuum | France | 7 |
| Contra Cultura | Pérou | 1 |
| Contraponto | Portugal | 1 |
| Contre-dires | France | 151 |
| Contrepoint | France | 6 |
| Conundrum Press | Canada | 1 |
| Convergences | France | 1 |
| Coolibri | | 1 |
| Coop Breizh | France | 108 |
| Copernic | | 8 |
| Copie Gauche | France | 1 |
| Coppenrath | Allemagne | 5 |
| Copper Canyon Press | Etats-Unis | 7 |
| Coprin | France | 5 |
| Cora | France | 2 |
| Corbaccio | Italie | 11 |
| Cordes de lune | France | 117 |
| Core Magazine | Japon | 5 |
| Corentin | France | 22 |
| Corgi | Angleterre | 332 |
| Corinne Ozenne | France | 17 |
| Cork University Press | Irlande | 4 |
| Cornac | Canada | 2 |
| Cornélius | France | 134 |
| Cornell University Press | Etats-Unis | 9 |
| Cornerstone Digital | France | 29 |
| Coronet | Angleterre | 16 |
| Corps 16 | France | 7 |
| Corraini | Italie | 1 |
