- Jesuits1
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- John IV, King of Portugal, 1604-16561
- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- Judaism1
- Kyi︠e︡vo-Pechersʹka lavra1
- Kölner Dom1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Latin poetry, Medieval and modern1
- Legal documents1
- Letters, Papal1
- Liebfrauenkirche (Halberstadt, Germany)1
- Local officials and employees--Salaries, etc.1
- Lollards1
- Ludwig IV, Holy Roman Emperor, 1282?-13471
- Magnificat (Music)1
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- Manuel I, King of Portugal, 1469-15211
- Manuscripts, Arabic1