Former Owner
- Sarah Dauphinais1
- Sarrià Capuchins1
- Sather, Eugene E. (Eugene Earl), 1924-19861
- Schenck'sche Fide-Kommiss-Bibliothek1
- Schøyen Collection1
- Scott Gwara4
- Scroop Egerton, 1st Duke of Bridgewater1
- Sebastianus Severus1
- Sebastienne Boscher1
- Seitenstetten Abbey1
- Sephan de Perusio1
- Sewell Thomas1
- Seymour Stocker Kirkup1
- Seymour de Ricci1
- Shabbetai1
- Silas W. Howland2
- Silvester Cattaneus1
- Simhah Pinsker1
- Simon Gratz3
- Simon Jason Schwartz1