Former Owner
- Arthur de l'Isle du Dréneuc1
- Asahel Grant1
- Ashridge Priory3
- Ashton Lever1
- Ashton Rollins Sanborn1
- Assemani family1
- Athelstan Riley1
- Audry Wilkens1
- August Merz1
- Augustinus de Cagnolis1
- Aulne Abbey2
- Austin, Jehan1
- Avraham Yedidiah Levi1
- Aḥmad ibn Mubārak Luṭf Allāh1
- Aḥmad ibn Muṣṭafá1
- B.C. Barker-Benfield1
- B.L. Riese1
- B.S. Cron1
- Baldasarre Boncompagni1
- Baldassarre Boncompagni3