Former Owner
- B.C. Barker-Benfield1
- B.L. Riese1
- B.S. Cron1
- Baldasarre Boncompagni1
- Barbara Hackenmayrin1
- Barbarigo family1
- Barbe de Laon1
- Baron Llangattock1
- Baron Paul Adolphe Dieudonné Thiébault1
- Bartholdus and Johann Flachmann1
- Bartholus Blancellus1
- Bartolomeo Amici1
- Bartolomeo di Larione Martelli1
- Basilica Gößweinstein1
- Basilica of Santa Maria Novella1
- Basilios Bessarion1
- Battle Abbey1
- Bayeux Cathedral1
- Beatrice de Fouar1
- Beinecke Rare Book & Manuscript Library1