Former Owner
- Bernard Quaritch Ltd1
- Betty Freudenheim1
- Bhaṭṭaṃbhaṭṭa1
- Biblioteca Bottigella1
- Biblioteca Trivulziana1
- Bibliotheca Beggadorum1
- Bibliotheca Philosophica Hermetica1
- Bill Jackson1
- Boies Penrose1
- Boies Penrose II1
- Brayton C. Ives1
- Breslauer and Meyer1
- Bristol Baptist College1
- Bruce P. Ferrini1
- Brudenell family1
- Budapest University of Jewish Studies1
- Burg Kreuzenstein1
- Byron Reed1
- Būtū ʻAbd al-Bāqī1
- C.B1