- Buonaventura, Caterina1
- Buondelmonti, Giovanni de'1
- Buralis, Jacopo de1
- Burelli, Bruno1
- Burhān al-Sharīʻah, Maḥmūd ibn ʻUbayd Allāh, -1274 or 1275. Wiqāyat al-riwāyah1
- Burial laws (Jewish law)1
- Burma1
- Byzantine literature1
- Béla IV, King of Hungary, 1206-12701
- Bālisī, Abū Bakr ibn Qiwām, -12601
- Cacciaguerra, Renaldus1
- Cafsuto, Moisè Vita, active 18th century1
- Calandra, Paolo del1
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- Callistus II, Pope, -11241