- Diet1
- Dion, approximately 408 B.C.-354 B.C.1
- Diplomatic relations1
- Dispensations1
- Dispute resolution (Law)1
- Dissenters, Religious1
- Divine office (Music)1
- Dominican sisters1
- Domitian, Emperor of Rome, 51-961
- Double cords1
- Dowry1
- Dream interpretation1
- Dulaert, Johannes1
- Durandus, of Saint-Pourçain, Bishop of Meaux, approximately 1275-13341
- Dyes and dyeing1
- Ecclesiastical geography1
- Eder, Georg, 1524-15871
- Education, Ancient1
- Elegiac poetry, Latin1
- Encheiridion harmonikēs (Nicomachus, of Gerasa)1