- De institutione musica (Boethius)1
- De motu animalium (Aristotle)1
- De partibus animalium (Aristotle)1
- Death registers1
- Death--Religious aspects--Islam1
- Deccani painting1
- Decorated paper bindings1
- Detti, Giovanni Baptista1
- Devotional exercises1
- Devotional literature, French1
- Devotional literature, German1
- Devotional poetry, Arabic1
- Di Leone, Francesco1
- Di Leone, Giovanni1
- Didactic literature, German1
- Didactic poetry, Latin (Medieval and modern)1
- Diocletian, Emperor of Rome, 245-3131
- Dionysius, the Areopagite, Saint, active 1st century1
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- Dissenters, Religious1