| clash | altercado |
| Clash of Civilizations | Choque de civilizaciones |
| Clash of the Titans | Furia de Titanes |
| clashing | contrastante |
| clasp | apretar |
| clasp knife | navaja |
| clasping | ajuste |
| class | clase |
| class diagram | diagrama de clases |
| Class of the Titans | Academia de titanes |
| class struggle | lucha de clases |
| class trip | viaje escolar |
| class warfare | lucha de clases |
| Class-Responsibility-Collaboration card | CRC tarjetas |
| Classe Préparatoire aux Grandes Écoles | Clases preparatorias a las grandes escuelas |
| Classes of United States Senators | Clases de Senadores de los Estados Unidos |
| classic | clásico |
| classic example | tipo |
| Classic female blues | Blues clásico femenino |
| Classic metal | Heavy metal |
| Classic rock | Rock clásico |
| classical | clásico |
| Classical antiquity | Antigüedad clásica |
| Classical Arabic | árabe clásico |
| Classical cepheid | Cefeida clásica |
| Classical Chinese | Chino clásico |
| Classical electromagnetism | Electromagnetismo |
| Classical element | Elementos de la antigüedad |
| Classical elements | Elementos de la antigüedad |
| Classical field theory | Teoría clásica de campos |
| Classical Indian dance | Danzas clásicas de India |
| Classical liberalism | Liberalismo clásico |
| Classical limit | Límite clásico |
| Classical mechanics | Mecánica clásica |
| Classical Mushroom | Infected Mushroom |
| Classical music | Música docta |
| Classical Nahuatl | náhuatl |
| Classical order | Órdenes clásicos |
| Classical planets in Western alchemy | Astrología y alquimia |
| Classical swine fever | Peste porcina |
| classicism | clasicismo |
| classicist | conocedor |
| classifiable | clasificable |
| classification | clase |
| Classification of discontinuities | Clasificación de discontinuidades |
| classified | sensitivo |
| classified ad | anuncio clasificado |
| classified advertisement | anuncio |
| classify | clasificar |
| classiness | elegancia |
| Classisism | Clasismo |
| Classism | Clasismo |
| classless | sin clases |
