| ▲Nombre▼⊗ | △País▼≋ | △Provincia▼ | ▲#▼ |
|---|---|---|---|
| The Cthulhu Conglomerate | Australia | Melbourne | 1 |
| Cinosargo Ediciones | Chile | Arica | 1 |
| Confusion | EE.UU. | Albuquerque, NM | 1 |
Chaosium  | EE.UU. | California | 219 |
| Chaosium Monograph | EE.UU. | California | 75 |
| Counterpoint | EE.UU. | California | 1 |
| Cryptozoic Entertainment | EE.UU. | California | 2 |
| Charlton Comics | EE.UU. | Derby, Connecticut | 1 |
| Charles D. Hornig | EE.UU. | Elizabeth, NJ | 1 |
| Charles W. Smith | EE.UU. | Haverhill, Mass. | 1 |
| Centipede Press | EE.UU. | Lakewood, Colorado | 1 |
| Caliber Comics | EE.UU. | Michigan | 11 |
| Charles Scribner's Sons | EE.UU. | Nueva York | 1 |
| Cryptic Publications | EE.UU. | Nueva York | 2 |
| Cryo Chamber | EE.UU. | Oregon | 7 |
| Clover Press | EE.UU. | San Diego, Ca | 1 |
| Canterbury Classics | EE.UU. | San Diego, CA. | 2 |
| Círculo Rojo | España | Almería | 2 |
| Conbarba | España | Almería | 1 |
| La Caja de Pandora / Proyectos Editoriales Crom | España | Barcelona | 7 |
| Edicions La Campana | España | Barcelona | 1 |
| Caralt | España | Barcelona | 3 |
| Club de rol Auryn | España | Barcelona | 5 |
| Columna Edicions | España | Barcelona | 1 |
| Cthulhu Project | España | Barcelona | 5 |