- Bible. Song of Solomon1
- Bible. Wisdom of Solomon1
- Binders' tickets1
- Biography1
- Blaise, Saint, -approximately 3161
- Blood--Circulation1
- Bona, Queen, consort of Sigismund I, King of Poland, 1494-15571
- Books of hours1
- Booksellers and bookselling1
- Booksellers' labels1
- Breviary (Catholic Church)1
- Brulefer, Etienne, -approximately 14991
- Burdah (Būṣīrī, Sharaf al-Dīn Muḥammad ibn Saʻīd)1
- Busdraghi, Matteo, 14th century1
- Busdraghi, Nicola, 14th century1
- Busdraghi, Piero, 14th century1
- Byzantine literature1
- Caesar, Julius1
- Calendar1
- Calendar reform1