- Jerónima de la Asunción, madre, 1555-16301
- Jesuit drama, Spanish1
- Jesuits1
- Jewish illumination of books and manuscripts1
- John I, King of Portugal, 1357-14331
- John the Baptist's Day1
- Juana, of Austria, Princess of Portugal, 1535-15731
- Khulāṣat al-ḥisāb (ʻĀmilī, Bahāʼ al-Dīn Muḥammad ibn Ḥusayn)1
- Kyriales1
- Latin language1
- Latin language--Study and teaching1
- Latin poetry1
- Laudatory poetry1
- Laudatory poetry, Latin1
- Law1
- Lawyers1
- Leather bindings1
- Lectionaries1
- Legal instruments1
- Lemos, Pedro Fernández Ruiz de Castro y Osorio, conde de, active 17th century1