- Jesuit drama, Spanish1
- Justa, Saint, -approximately 2871
- Knights of Malta1
- Land grants1
- Latin language--Study and teaching1
- Latin poetry1
- Laudatory poetry, Latin1
- Legal documents1
- Lemos, Pedro Fernández Ruiz de Castro y Osorio, conde de, active 17th century1
- Lemos, Pedro Fernández de Castro, conde de, 1576-16221
- Leocadia, Saint, -3031
- Letter of Aristeas1
- León, Luis de, 1527-15911
- Liturgical books1
- Lorraine, Nicolas-François, duc de, 1609-16701
- Macaronic poetry1
- Macaronic verse1
- Magic1
- Manners and customs1
- Manuscripts, Galician1