Former Owner
- Apostolo Zeno1
- Appiano family1
- Archer Milton Huntington1
- Archibald Cary Coolidge1
- Archibald Primrose, 5th Earl of Rosebery1
- Arenburg1
- Arno M. Voynich1
- Arnold Jansen op de Haar1
- Artemesia Piccolomini1
- Arthur Annesley, 1st Earl of Anglesey1
- Arthur Griffith1
- Arthur Haddaway1
- Arthur Hood, 1st Baron Hood of Avalon1
- Arthur Lee Loeb1
- Arthur Liddell, 5th Baron Ravensworth1
- Arthur M. Ellis1
- Arthur M. Elliz1
- Arthur Thomas Bannister1
- Arthur de l'Isle du Dréneuc1
- Asahel Grant1