Former Owner
- Bentley Lyonel John Tollemache, 3rd Baron Tollemache1
- Bern Dibner1
- Bernard Quaritch Ltd1
- Betty Freudenheim1
- Bhaṭṭaṃbhaṭṭa1
- Biblioteca Bottigella1
- Biblioteca Trivulziana1
- Bibliotheca Beggadorum1
- Bibliotheca Philosophica Hermetica1
- Bill Jackson1
- Boies Penrose1
- Boies Penrose II1
- Bonvesino, Marco1
- Brayton C. Ives1
- Breslauer and Meyer1
- Brinton, Daniel G. 1837-18991
- Bruce P. Ferrini1
- Brudenell family1
- Budapest University of Jewish Studies1
- Burg Kreuzenstein1