- Devotion to.3
- Devotional literature1
- Devotional literature, Italian5
- Devotional literature, Latin1
- Devotional literature, Latin (Medieval and modern)3
- Devotional literature, Latin (Medieval and modern).1
- Dialogues, Greek3
- Dialogues, Latin7
- Dialogues, Latin (Medieval and modern)4
- Didactic literature2
- Didactic literature, Greek1
- Didactic literature, Latin8
- Didactic literature, Latin (Medieval and modern)9
- Didactic poetry, Latin2
- Diplomacy1
- Diplomatic and consular service, Papal States1
- Divination2
- Doctors of the Church1
- Dogs2
- Drawing1
Libraries & Collections
- Arts Library
- Bass Library
- Beinecke Library
- Classics Library
- Divinity Library
- Film Study Center
- Fortunoff Archive
- Humanities Collections
- International Collections
- Law Library
- Lewis Walpole Library
- Library Collection Services
- Manuscripts & Archives
- Map Collection
- Marx Science & Social Science Library
- Medical Library
- Music Library
- Sterling Library
- Yale Center for British Art
