- Buonaccorsi, Constanza1
- Buonaccorsi, Niccolò di Piero1
- Buonaccorsi, Piero1
- Buonamici, Giovanni Francesco1
- Buonanni, Francesco1
- Buonaventura, Caterina1
- Buondelmonte, Piero1
- Buondelmonti, Giovanni de'1
- Buralis, Jacopo de1
- Burdah (Būṣīrī, Sharaf al-Dīn Muḥammad ibn Saʻīd)1
- Burelli, Bruno1
- Burial laws (Jewish law)1
- Burma1
- Busdraghi, Matteo, 14th century1
- Busdraghi, Nicola, 14th century1
- Busdraghi, Piero, 14th century1
- Business mathematics1
- Business records1
- Byzantine Empire2
- Byzantine literature1