| English | Italian | Spanish | French | German |
|---|---|---|---|---|
| English | Italian | Spanish | French | German |
| cancellation | annullamento | cancelación | oblitération | entwertung |
| cancellation, postmark | timbro postale | matasellado | oblitération | abstempelung |
| cancelled | annullato | cancelado | annulé | gestempelt |
| castle | castello | castillo | château | schloss |
| catalog | catalogo | catálogo | catalogue | katalog |
| centenary | centenario | centenario | centenaire | jahrhundertfeier |
| centered | centrato | centrado | centré | zentriert |
| chalk-surfaced paper | carta gessata | papel estucado | papier couché | kreidepapier |
| chess | scacchi | ajedrez | échecs | schach |
| Christmas | Natale | Navidad | Noël | Weihnachten |
| circle | cerchio | círculo | cercle | kreis |
| close | vicino | estrecho | étroit | eng |
| coat of arms | stemma | escudo | armoiries | Wappen |
| coil | bobina | bobina | enroulement | rolle |
| collector | collezionista | coleccionista | collecteur | sammler |
| colour | colore | color | couleur | farbe |
| colour error | errore di colore | error de color | erreur de couleur | fehlfarbe |
| colour shade | sfumatura | variedad de color | nuance | farbnuance |
| coloured | colorato | colorido | coloré | farbig |
| commemorative | commemorativo | comemorativo | commémoratif | sondermarke |
| corner | angolo | esquina | angle | ecke |
| correspondence | corrispondenza | correspondencia | correspondance | Schriftverkehr |
| country | paese | país | pays | land |
| cover | busta | sobre | enveloppe | brief |
| creased | piegato | arrugado | plissé | buegig |