- Bonus, Petrus, active 1323-1330--Manuscripts1
- Books and reading1
- Booksellers and bookselling1
- Bouchard family1
- Bracciolini, Poggio, 1380-14591
- Bracciolini, Poggio, 1380-1459. Correspondence1
- Breviary (Catholic Church)1
- Brocade bindings1
- Brudenell family1
- Bucolica (Virgil)1
- Buffoni, Baldello1
- Buonamici, Giovanni Francesco1
- Burlaeus, Gualterus, 1275-1345?1
- Business ethics1
- Byzantine Empire1
- Cabala1
- Cabala and Christianity1
- Caesar, Julius1
- Caesarius, of Arles, Saint, 470?-5421
- Calendar reform1