- Di Leone, Francesco1
- Di Leone, Giovanni1
- Dialogi (Gregory I, Pope)1
- Dialogues (Literature)1
- Dialogues, Greek1
- Dictators as authors1
- Didactic literature1
- Didactic literature, English (Middle)1
- Didactic poetry, Latin1
- Didactic poetry, Latin (Medieval and modern)1
- Diet1
- Dioceses1
- Diocletian, Emperor of Rome, 245-3131
- Dion, approximately 408 B.C.-354 B.C.1
- Directories1
- Divine office--Liturgy1
- Double cords1
- Drycthelm, monk of Northumbria, active 7th century1
- Dupin, Jean, 1302-13721
- Durandus, of Saint-Pourçain, Bishop of Meaux, approximately 1275-13341