- Illumination of books and manuscripts, English1
- Illumination of books and manuscripts, Medieval3
- Islamic magic2
- Islamic occultism2
- Italian letters1
- Italian poetry3
- Jails2
- Jews3
- Laboratories7
- Laboratory Techniques and Procedures1
- Latin language2
- Latin letters, Medieval and modern1
- Latin literature, Medieval and modern1
- Latin poetry, Medieval and modern1
- Laundresses1
- Lions1
- Lithographed books1
- Logic1
- Magic4
- Magic squares1
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
