Former Owner
- Antonio de Bonius1
- Antony Bek1
- Appiano family1
- Arenburg1
- Ariel Toaff1
- Arnold Jansen op de Haar1
- Arnold Mettler2
- Art ancien S.A.2
- Arthur Brölemann1
- Arthur Kay1
- Arthur Lee Loeb1
- Arthur Liddell, 5th Baron Ravensworth1
- Arthur M. Ellis1
- Ashridge Priory1
- Athelstan Riley1
- August Merz1
- Augustinus de Cagnolis1
- Augustus Pugin1
- Austin, Jehan1
- Avraham Yedidiah Levi1