Publishers
- Ant Belmont 2
- Anthony Blond 2
- Anthony Nelson Ltd. 1
- Antique Collectors' Club 9
- Antonio Delfino Editore 1
- Anuart Ediciones 1
- Apach Publishing 1
- Aperture 1
- Apple Academic Press Inc. 1
- Apple Press 1
- Apple Tree Press 1
- Applied Science Publishers Ltd. 3
- Apress 1
- Aquarian Thorsons 1
- Arandar Books Ltd. 2
- Arbeit Munich 1
- Arbor House 1
- Arcadia 4
- Archaeologia Cambrensis 1
- Archangel Press 2
- Archetype Publications 1
- Archibald Constable & Co. Ltd. 4
- Archibald Constable And Co. 2
- Archibald Constable And Company 1
- Archipelago Press 1
- Architectural And Archaeological Society Of Durham And Northumberland 1
- Archon Books 1
- Arco 1
- Arco Publications 2
- Arco Publishing 4
- Arctic Fox Books 1
- Argosy-Antiquarian Ltd. 1
- Argraffdy'R Methodistiaid Calfinaidd 1
- Argus Books 4
- Argyll Bird Club 1
- Argyll Publishing 1
- Ariel Publishing 1
- Arkstee & Merkus 1
- Arlington Books 2
- Armada 18
- Arms & Armour Press 36
- Army Apprentices College Chepstow 1
- Arnold 3
- Arnold Wheaton 2
- Arnoldo Mondadori 1
- Arrow Publishing 1
- Arrowsmith 1
- Art & Educational Publishers Limited 2
- Art & Humour Publishing Co. 1
- Art & Humour Publishing Co. Ltd. 1
- Art Books International 1
- Art Gallery Of Alberta 1
- Art Services International 2
- Artabras 1
- Artech House 1
- Artes Mundi 1
- Arthur Ackermann 1
- Arthur Barker Limited 7
- Arthur Barker Ltd. 7
- Arthur Barron Ltd. 2
- Arthur Edwards 1
- Arthur H. Stockwell Ltd. 6
- Arthur L. Humphreys 1
- Arthur Wigley & Sons Ltd. 1
- Arti Grafiche Gajani 1
- Arti Grafiche Saturnia 1
- Artia 1
- Artifice 1
- Artima 1
- Artis-Historia Publishing 1
- Artists' Choice Editions 1
- Arts and General Publishers Ltd. 1
- Artur Wolf 2
- Ashford 1
- Ashgate 5
- Ashgate Publishing Company 3
- Ashgrove Press 1
- Ashley James Limited 1
- Asia Publishing House 2
- Asiatype, Inc. 1
- Aslib 2
- Associacio Per A La Defensa De La Natura 1
- Associated Newspapers 1
- Associated Newspapers Ltd. 2
- Associated University Press 1
- Aston Martin 1
- Aston Publications 17
- Atelier Books 1
- Atheneum 2
- Atlantic Books 2
- Atlantic Monthly Press 1
- Atlantic Publishers 9
- Atlantic Transport Publishers 3
- Atlas Books 1
- Atlas Publishing & Distributing Co. Ltd. 1
- Atrium Press Ltd. 2
- Audi Ag 1
- Augener Ltd. 13
- Augustus M. Kelley 4
- Aukland Art Gallery Toi O Tamaki 1