- Liber sextus decretalium (Catholic Church)1
- Library catalogs1
- Little office of the Blessed Virgin Mary (Catholic Church)1
- Liturgies1
- Livres de chant liturgique1
- Lord's Supper--Catholic Church--History of doctrines1
- Louis IX, King of France, 1214-12701
- Louis, Saint, Bishop of Toulouse, 1274-12971
- Ludwig IV, Holy Roman Emperor, 1282?-13471
- Luke, Saint1
- Lumbres, Ernulfus de1
- Magi1
- Magic1
- Magistrates, Roman1
- Magna Carta1
- Majolus, Saint, Abbot of Cluny, approximately 906-9941
- Manuscript waste (Binding)1
- Manuscripts, Czech1
- Manuscripts, Dutch1
- Manuscripts, Greek1