- De bello Gallico (Caesar, Julius)1
- De ente et essentia (Thomas, Aquinas, Saint)1
- De finibus bonorum et malorum (Cicero, Marcus Tullius)1
- De gradibus humilitatis et superbiae (Bernard, of Clairvaux, Saint)1
- De institutione musica (Boethius)1
- De mundo (Aristotle)1
- De oratore (Cicero, Marcus Tullius)1
- De partibus animalium (Aristotle)1
- Debts, External1
- Debts, Public1
- Declination (Astronomy)1
- Decorated edges1
- Decoration and ornament1
- Deeds1
- Denmark1
- Devices (Heraldry)1
- Devotio moderna1
- Devotion to the Blessed Virgin Mary1
- Devotional exercises1
- Devotional poetry, French1