- Jiménez de Enciso, Andrés1
- Jiménez de Enciso, Diego1
- Jiménez de Enciso, Pedro1
- Juan II, King of Castile and Leon, 1405-14541
- Juana, la Loca, Queen of Castile, 1479-15551
- Juana, of Austria, Princess of Portugal, 1535-15731
- Justa, Saint, -approximately 2871
- Justice, Administration of1
- Knights of Malta1
- Ladron de Guevara family1
- Land titles--Registration and transfer1
- Learning and scholarship1
- Leases1
- Legacies1
- Legaspi, Margarita de1
- Leocadia, Saint, -3031
- Liturgics1
- Local officials and employees1
- López de Legaspi, Miguel, -15721
- Magic1