- Racially mixed people--Legal status, laws, etc.1
- Ramiro II, King of Leon, -9511
- Real property1
- Religious life1
- Roderick, King of the Visigoths, -711?1
- San Miguel, Josefa de, active 1683-16851
- Sancho II, King of Castile and Leon, 1037 or 1038-10721
- Sancho IV, King of Castile and Leon, 1257-12951
- Sarmiento, Pero. Sentencia-Estatuto1
- Satire1
- Satires1
- Sea fiction1
- Sea stories, Spanish1
- Service books (Music)--Catholic Church1
- Seven Years' War (1756-1763)1
- Shipping1
- Silva, Juan de, Conde de Cifuentes1
- Spain--Alcalá de Henares1
- Spain--Barcelona1
- Spain--Burgos1