Former Owner
- Appiano family1
- Archer Milton Huntington1
- Archibald Cary Coolidge1
- 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 Kay1
- Arthur Lee Loeb1
- Arthur M. Ellis1
- Arthur M. Elliz1
- Arthur Thomas Bannister1
- Arthur de l'Isle du Dréneuc1
- Ashton Lever1
- Ashton Rollins Sanborn1
- Assemani family1
- Athelstan Riley1