Former Owner
- Arthur Annesley, 1st Earl of Anglesey1
- Arthur Brölemann1
- Arthur Kay1
- Arthur Liddell, 5th Baron Ravensworth1
- Arthur M. Ellis1
- Audry Wilkens1
- Baldasarre Boncompagni1
- Baptist Union Theological Seminary1
- Barbarigo family1
- Barbe de Laon1
- Baron Llangattock1
- Bartolomeo Amici1
- Bateman family1
- Battista di Ser Cicco di Fermo1
- Battle Abbey1
- Beatrice de Fouar1
- Beinecke Rare Book & Manuscript Library1
- Benjamin Franklin Stevens1
- Bern Dibner1
- Bernard Halliday1