- Buonaventura, Caterina1
- Buondelmonte, Piero1
- Buondelmonti, Giovanni de'1
- Buralis, Jacopo de1
- Burelli, Bruno1
- Busdraghi, Matteo, 14th century1
- Busdraghi, Nicola, 14th century1
- Busdraghi, Piero, 14th century1
- Business ethics1
- Business mathematics1
- Byzantine chants1
- Bāb al-Ḥādī ʻashar (Ibn al-Muṭahhar al-Ḥillī, al-Ḥasan ibn Yūsuf)1
- Bēssariōn, Cardinal, 1403-14721
- Cabala and Christianity1
- Caesarius, of Arles, Saint, 470?-5421
- Calandra, Paolo del1
- Calendar, Roman1
- Calendars of saints1
- Caliphs1
- Calligraphers1