- Breviaries5
- Breviary (Catholic Church)1
- Bridles2
- Bristol, John Digby, Earl of, 1580-16541
- Brulefer, Etienne, -approximately 14991
- Buildings1
- Buonaccorsi family1
- Buonaccorsi, Constanza1
- Buonaccorsi, Niccolò di Piero1
- Buonaccorsi, Piero1
- Busdraghi, Matteo, 14th century1
- Busdraghi, Nicola, 14th century1
- Busdraghi, Piero, 14th century1
- Business mathematics2
- Byzantine Empire2
- Byzantine literature1
- Būṣīrī, Sharaf al-Dīn Muḥammad ibn Saʻīd, 1213?-1296? Burdah1
- Cabala1
- Caesar, Julius1
- Calendar1