- Davanzati, Niccolò1
- De bello Gallico (Caesar, Julius)1
- De consolatione philosophiae (Boethius)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
- Death registers1
- Death--Religious aspects--Christianity1
- Decedents' estates1
- Declination (Astronomy)1
- Decretales Gregorii IX (Catholic Church)1
- Deerskin bindings1
- Del Torto, Andrea1
- Delci, Aldobrando1
- Delci, Niccolò1
- Della Casa, Filippo1
- Della Rovere, Giorgio1
- Demosthenes1
- Denmark1