- Blaise, Saint, -approximately 3161
- Blessed1
- Blind stamped bindings1
- Boccaccio, Giovanni, 1313-13751
- Bonus, Petrus, active 1323-1330--Manuscripts1
- Booksellers and bookselling1
- Booksellers' labels1
- Borders, Ornamental (Decorative arts)1
- Bracciolini, Poggio, 1380-14591
- Bracciolini, Poggio, 1380-1459. Correspondence1
- Brass clasps1
- Breviary (Catholic Church)1
- Bridget, of Sweden, Saint, approximately 1303-13731
- Brocade bindings1
- Brudenell family1
- Buddhism1
- Bulls, Papal1
- Business ethics1
- Business mathematics1
- Byzantine Empire1