- Chronologies3
- Church year sermons3
- Civilization3
- Clare, of Assisi, Saint, 1194-12533
- Commonplace books3
- Compasses (Mathematical instruments)3
- Concini, Giovanbattista3
- Concordances3
- Confession (Liturgy)3
- Confraternities3
- Contracts (Islamic law)3
- Coptic language3
- Corvus3
- Cosimo I, Grand-Duke of Tuscany, 1519-15743
- Cosmology3
- Counter-Reformation3
- Dalāʼil al-khayrāt (Jazūlī, Muḥammad ibn Sulaymān)3
- De interpretatione (Aristotle)3
- De' Medici, Luigi, principe di Ottaviano, 1759-18303
- Deadly sins3