- Scolario, Bartolomeo di1
- Scotti, Mariano de Ristori di1
- Scyld (Legendary character)1
- Seals (Numismatics)1
- Sebastian, Saint1
- Seneca, Lucius Annaeus, approximately 4 B.C.-65 A.D.1
- Sequentiaries1
- Serfdom1
- Serfs--Emancipation1
- Sermini, Baldassare Girolamo1
- Sermini, Giovanni1
- Serotini, Checca1
- Severus, Lucius Septimius, Emperor of Rome, 146-2111
- Shelf marks1
- Sicarda1
- Siena (Italy). Tribunale dei Pupilli1
- Silvestro, Jacopo di1
- Simone, Francesco di1
- Simony1
- Singing--Instruction and study1