- Rueda, Luis de, active 1553-15691
- Rueda, Rodrigo de, active 1553-15691
- Rufina, Saint, -approximately 2871
- Sancho Garcés I, King of Navarre, -9251
- Sancho II, King of Castile and Leon, 1037 or 1038-10721
- Sarmiento, Pero. Sentencia-Estatuto1
- Satire1
- Satires1
- Science1
- Sententiarum libri IV (Peter Lombard, Bishop of Paris)1
- Sephardim1
- Sepúlveda, Juan Ginés de, 1490-15731
- Sermons, Latin1
- Sermons, Spanish1
- Shavuot sermons1
- Shipping1
- Silver clasp plates1
- Silver mines and mining1
- Smelting1
- Spain--Alcalá de Henares1