- Sachs, Paul J. , 1878-1965 Previous Owner
- Sala, Giuseppe Antonio Previous Owner
- Salerni, Giovanni Andrea Previous Owner
- Salice, Antonio Francesco Previous Owner
- Salvi, C. Previous Owner
- Sandoz, Édouard Marcel 1881-1971 Previous Owner
- Schaffhausen Stadtbibliothek Previous Owner
- Schiavi, Filippo Previous Owner
- Schloss Ambras Innsbruck Previous Owner
- Schnalser Kartause Previous Owner
- Schönenwerd Stiftskirche Sankt Leodegar Previous Owner
- Scott, John, 1830-1903 Previous Owner
- Scuola Tecnica Locarno Previous Owner
- Sichardus, Johannes, 1499-1552 Previous Owner
- Sigmund, der Münzreiche (1424/27–1496) Previous Owner
- Snellaert, Ferdinand Augustijn (1809-1872) Previous Owner
-
Sommaria, Guglielmo L. dalla
Libri, Guillaume (1803-1869) Previous Owner - Sormani, Giuseppe Antonio Previous Owner
- Soromenho, Augusto, 1834-1878 Previous Owner
- St Barnabas Theological College (Adelaide) Previous Owner
- St. Ursenstift Solothurn Previous Owner
- Staatsbibliothek zu Berlin-Preußischer Kulturbesitz Previous Owner
- Stadt Solothurn Previous Owner
- Stark, Ludwig -1666 Previous Owner
- Steiner, Clemens -1550 Previous Owner
- Stift St. Leonhard Basel Previous Owner
- Stockmans, Jan Baptist Previous Owner
- Stracke, D.A. , 1875-1970 Previous Owner
- Stroganov, Grigorij, graf, 1829-1910 Previous Owner
- Styrzel, Johannes Georg, 1591-1668 Previous Owner
- Supersaxo, Bartholomäus (1638-1640 Bischof von Sitten) Previous Owner
- Supersaxo, Georg (1450-1529) Previous Owner