Former Owner
- Bhālacandra Gaṇeśa1
- Bibliotheca Philosophica Hermetica1
- Binyamin ben Salem Elark1
- Boies Penrose II1
- Bone, Michael1
- Bonvesino, Marco1
- Brahmānaṃdatīrtha1
- Bridgewater Library1
- Brinton, Daniel G. 1837-18991
- Budapest University of Jewish Studies1
- Burg Kreuzenstein1
- Burndy Library1
- Bāpaṭa Kṛṣṇabhaṭa1
- Bīkānera Anūpa Saṃskr̥ta Pustakālaya1
- Būtū ʻAbd al-Bāqī1
- Camillo Riccio1
- Carleton Rubira Richmond1
- Carlo Longland1
- Carlos José Gutiérrez de los Ríos y Rohan Chabot Fernán-Núñez1
- Caspar René Gregory1