Former Owner
- Antoine de Court1
- Anton Birlinger1
- Antoni Jerzy Apponyi1
- Antonio Assemani1
- Antonio Cánovas del Castillo1
- Antonio Dominico Restis1
- Antonio Marino de Caboga1
- Antonio Medin1
- Antonio Pallavicini Gentili1
- Antonio de Bonius1
- Antonius Mensing1
- Apostolo Zeno1
- Appiano family1
- Archer Milton Huntington1
- Arenburg1
- Arno M. Voynich1
- Arnold Jansen op de Haar1
- Artemesia Piccolomini1
- Arthur Annesley, 1st Earl of Anglesey1
- Arthur Griffith1