Former Owner
- Bernardo Mendel1
- Bertram Ashburnham, 4th Earl of Ashburnham8
- Bet din tsedeḳ London ṿeha-medinah3
- Bhacaṃbhat1
- Bhatta Narayana1
- Bhauruji, Pandit1
- Bhaṭṭaśivākānta Lakṣmīkānta1
- Bhaṭṭaṃbhaṭṭa1
- Bhālacandra Gaṇeśa1
- Bibliotheca Philosophica Hermetica1
- Binyamin ben Salem Elark1
- Boies Penrose II1
- Brahmānaṃdatīrtha1
- Bridget Hunt1
- Bridgewater Library1
- Bristol Baptist College1
- Budapest University of Jewish Studies1
- Burg Kreuzenstein1
- Burndy Library1
- Buxheim Charterhouse4