Former Owner
- Barbara Hackenmayrin1
- Barbarigo family1
- Barbe de Laon1
- Barbeau Abbey1
- Baron Llangattock1
- Baron Paul Adolphe Dieudonné Thiébault1
- Bartholdus and Johann Flachmann1
- Bartholus Blancellus1
- Bartolomeo Amici1
- Basilica Gößweinstein1
- Basilica of Sant'Ambrogio1
- Basilica of Santa Maria Novella1
- Basilios Bessarion1
- Bateman family2
- Battista di Ser Cicco di Fermo1
- Battle Abbey1
- Bayeux Cathedral1
- Beatrice de Fouar1
- Beauvais Cathedral3
- Beinecke Rare Book & Manuscript Library1