- John V, King of Portugal, 1689-17501
- John the Baptist's Day1
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism--Controversial literature1
- Judgment Day1
- Julian, of Eclanum, Bishop, 380-approximately 4551
- Julius III, Pope, 1487-15551
- Kapitalbünde1
- Kekchi language1
- Kings and rulers1
- Kings and rulers--Duties1
- Knowledge, Theory of (Religion)1
- Kölner Dom1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Land tenure1
- Last Supper1
- Law1
- Legends1
- Lent--Liturgy1
- Leo X, Pope, 1475-15211