- Councils and synods, Ecumenical1
- Courtesy books1
- Crusades1
- Cur Deus homo (Anselm, Saint, Archbishop of Canterbury)1
- Cynics (Greek philosophy)1
- De anima (Aristotle)1
- De generatione et corruptione (Aristotle)1
- De gradibus humilitatis et superbiae (Bernard, of Clairvaux, Saint)1
- Death registers1
- Despotism1
- Devices (Heraldry)1
- Didactic literature, Latin (Medieval and modern)1
- Dionysius, the Areopagite, Saint, active 1st century1
- Discipline1
- Discoveries in geography1
- Diseases1
- Dissertations, Academic1
- Divine office1
- Divine office (Music)1
- Dominikanerinnenkloster Heilig Kreuz Regensburg1