- Letters patent1
- Liber sextus decretalium (Catholic Church)1
- Library catalogs1
- Libri amicorum1
- Lilium medicinae (Bernard, de Gordon)1
- Lippomano, Luigi, 1500-15591
- Litanies1
- Little office of the Blessed Virgin Mary (Catholic Church)1
- Liturgical lessons1
- Liturgics--Calendar1
- Local history1
- Local history--Sources1
- Logic, Ancient1
- Lombards1
- Lord's Supper--Catholic Church1
- Lord's Supper--Catholic Church--History of doctrines1
- Lorraine, Nicolas-François, duc de, 1609-16701
- Louis IX, King of France, 1214-12701
- Louis, Saint, Bishop of Toulouse, 1274-12971
- Love poetry, Classical1