- Civilization3
- Clare, of Assisi, Saint, 1194-12533
- Classification3
- Coffee3
- Commonplace books3
- Compasses (Mathematical instruments)3
- Concini, Giovanbattista3
- Concordances3
- Confession (Liturgy)3
- Confraternities3
- Conspiracy of Catiline (Rome : 65-62 B.C.)3
- Contracts3
- Corvus3
- Cosimo I, Grand-Duke of Tuscany, 1519-15743
- Counter-Reformation3
- Dalāʼil al-khayrāt (Jazūlī, Muḥammad ibn Sulaymān)3
- Daniel (Biblical figure)3
- Dawwānī, Muḥammad ibn Asʻad, 1426 or 1427-1512 or 1513. Risālah al-qadīmah fī ithbāt al-wājib3
- De interpretatione (Aristotle)3
- De' Medici, Luigi, principe di Ottaviano, 1759-18303