| caldero | boiler |
| Caldero de Gundestrup | Gundestrup cauldron |
| calderón | caldron |
| Caldesia | Caldesia |
| caldo | stock |
| Caldo verde | Caldo verde |
| Calea zacatechichi | Calea zacatechichi |
| Caleb | Caleb |
| Caleb Cushing | Caleb Cushing |
| Caledonia | Caledonia |
| calefacción | furnace |
| calefacción central | central heating |
| calefacción urbana | district heating |
| caleidoscopio | kaleidoscope |
| caleidoscópico | kaleidoscopic |
| Calenardhon | Calenardhon |
| calendario | calendar |
| Calendario armenio | Armenian calendar |
| Calendario azteca | Aztec calendar |
| Calendario celta | Celtic calendar |
| Calendario chino | Chinese calendar |
| Calendario dariano | Darian calendar |
| Calendario de aniversarios | List of historical anniversaries |
| Calendario de Coligny | Coligny calendar |
| Calendario de Ussher-Lightfoot | Ussher chronology |
| Calendario egipcio | Egyptian calendar |
| calendario gregoriano | Gregorian calendar |
| Calendario hebreo | Hebrew calendar |
| Calendario helénico | Hellenic calendar |
| Calendario hindú | Hindu calendar |
| Calendario holoceno | Holocene calendar |
| Calendario juliano | Julian calendar |
| Calendario litúrgico | Liturgical year |
| Calendario maya | Maya calendar |
| Calendario Mundial | World Calendar |
| Calendario musulmán | Islamic calendar |
| Calendario persa | Iranian calendar |
| Calendario republicano francés | French Republican Calendar |
| Calendario revolucionario | Revolutionary calendar |
| Calendario revolucionario soviético | Soviet revolutionary calendar |
| Calendario romano | Roman calendar |
| Calendario rúnico | Runic calendar |
| calendario solar | solar calendar |
| Calendario ático | Attic calendar |
| Calendula officinalis | Calendula officinalis |
| calentado al rojo blanco | white-hot |
| calentador | boiler |
