Former Owner
- Benediktinerinnenabtei St. Walburg1
- Benetto Spinelli1
- Benoît Le Court1
- Bentley Lyonel John Tollemache, 3rd Baron Tollemache1
- Bergendal Collection1
- Bernard M. Rosenthal1
- Bernard Quaritch1
- Bernardo Bembo1
- Biblioteca Trivulziana1
- Biblioteka Tulezynska1
- Bibliotheca Beggadorum1
- Birgittinessenklooster Mariënwater1
- Boies Penrose1
- Boies Penrose II1
- Branners Bibliofile Antikvariat1
- Breslauer and Meyer1
- Brian Douglas Stilwell1
- Brick Row Book Shop1
- Bury St Edmunds Abbey1
- Buxheim Charterhouse1