- Salt industry and trade--Law and legislation1
- San Miguel, Josefa de, active 1683-16851
- Sanchez de Bustamente, Luis1
- Sancho Garcés I, King of Navarre, -9251
- Sancho II, King of Castile and Leon, 1037 or 1038-10721
- Sarmiento, Pero. Sentencia-Estatuto1
- Satire1
- Satire, Spanish1
- Satires1
- Sea fiction1
- Sea stories, Spanish1
- Seals (Numismatics)1
- Seals, wax1
- Sepúlveda, Juan Ginés de, 1490-15731
- Sermons, Latin1
- Sermons, Nahuatl1
- Sermons, Tzeltal1
- Service books (Music)--Catholic Church1
- Seven Years' War (1756-1763)1
- Shipping1