Former Owner
- Baldassarre Boncompagni1
- Baptist Union Theological Seminary2
- Barbara Hackenmayrin1
- Bartholdus and Johann Flachmann1
- Basilica Gößweinstein1
- Basilios Bessarion1
- Bernard M. Rosenthal8
- Bernard Quaritch1
- Bernard Quaritch Ltd1
- Bernardo Mendel1
- Bertram Ashburnham, 4th Earl of Ashburnham2
- Bet din tsedeḳ London ṿeha-medinah1
- Birch & Son1
- Boies Penrose II1
- Bonaventura Brem1
- Branners Bibliofile Antikvariat1
- Bruce P. Ferrini1
- Burg Kreuzenstein1
- Buxheim Charterhouse5
- Caesareum Societatis Jesu Collegium Viennense1