- Cortesi, Girolamo1
- Cosimo I, Grand-Duke of Tuscany, 1519-15744
- Cosimo II, Grand Duke of Tuscany, 1590-16211
- Cosimo III, Grand-Duke of Tuscany, 1642-17231
- Cosmography1
- Cosmology, Medieval1
- Courts and courtiers2
- Creation (Islam)5
- Credit1
- Criticism and interpretation5
- Criticism, Textual14
- Criticism, interpretation, etc.27
- Cronica general de España (Ocampo, Florián de)1
- Crypto-Jews--Legal status, laws, etc.1
- Cryptography1
- Czech Republic--Roudnice nad Labem1
- Dafrī, ʻUmar ibn ʻUmar, d. 1668. Durrah al-munīfah fī fiqh Abī Ḥanīfah1
- Dafrī, ʻUmar ibn ʻUmar, d. 1668. Durrah al-munīfah fī fiqh Abī ḥanīfah1
- Dalālat al-ḥāʼirīn (Maimonides, Moses)1
- Dawwānī, Muḥammad ibn Asʻad, 1426 or 1427-1512 or 1513. Risālah al-qadīmah fī ithbāt al-wājib1