Former Owner
- Antonio Ubaldini1
- Antonio de Bonius1
- Antonio di Matteo di Giovanni Foresi da Bibbiena1
- Antonius Mensing1
- Antony Bek1
- Apostolo Zeno1
- Appiano family1
- Archer Milton Huntington1
- Archibald Cary Coolidge1
- Archibald Primrose, 5th Earl of Rosebery1
- Arenburg2
- Ariel Toaff1
- Arno M. Voynich1
- Arnold Jansen op de Haar1
- Arnold Mettler4
- Art ancien S.A.8
- Artemesia Piccolomini1
- Arthur Annesley, 1st Earl of Anglesey1
- Arthur Brölemann4
- Arthur Griffith1