Publishers
- Aerospace 8
- Ahmadu Bello University Press 3
- Aidan Ellis Publishing Limited 1
- Aidu(raf) 1
- Aip Press 1
- Air Britain 1
- Air Crew Association 1
- Air Force History & Museums Program 2
- Air Ministry 1
- Air Museum Publications (york) Ltd 1
- Air Review Ltd. 2
- Air University Press 1
- Air-Britain 1
- Air-Britain (historians) Ltd. 20
- Aircraft Technical Publications Limited 1
- Airlife 56
- Aj-Press 1
- Aladdin Books 1
- Alain De Gourcuff Editeur 1
- Alan Leech 1
- Alan Sutton 47
- Alaska Northwest Publishing Company 1
- Albatros Productions Ltd. 4
- Albert E. Marriott 2
- Albert W. Greenwade 1
- Albert Whitman & Company 1
- Albion House 3
- Albyn Press 1
- Alden & Company Limited 1
- Alden Press 3
- Aldine Books 1
- Aldine Publishing Company 1
- Aldus Books 1
- Alec Tiranti 1
- Alecto Historical Editions 2
- Alex Hogg 2
- Alexander Gardner 2
- Alexander Maclehose & Co. 2
- Alexander Moring Ltd. 3
- Alexander Strahan 1
- Alf Cooke Ltd. 10
- Alfred A. Knopf 7
- Alfred A. Knopf, Inc. 2
- Alfred Hahns 1
- Alfred Mame Et Fils 1
- Alison Green Books 1
- Alison Hodge 2
- Allan North 1
- Allan T. Condie 1
- Allan W. Stobbs 2
- Allan Wingate 2
- Allan Wingate (publishers) Ltd 1
- Allen & Unwin 2
- Allen Figgis 1
- Allen Lane 14
- Allenson & Co. Ltd. 1
- Allison & Busby 1
- Alloway 1
- Allyn & Bacon 2
- Allyn and Bacon Inc. 1
- Almark Publishing Co. Ltd. 8
- Alpha Science International Limited 1
- Alphabooks 1
- Alpine 2
- Alpine Fine Arts Collection 2
- Alpine Publications, Inc. 1
- Alston Rivers Ltd. 1
- Altitude Publishing 1
- Amadeus Press 1
- Amazon Publications 4
- Amber Books 2
- Amberley 16
- Amberley Publishing 6
- American Asssociation For The Advancement Of Science 1
- American Heritage Publishing Co. Inc. 1
- American Institute Of Architects 1
- American Institute Of Chemical Engineers 1
- American Iron And Steel Institute 1
- American Mathematical Society 8
- American Society Of Agricultural Engineers 2
- Amex Company Limited 1
- Amex Company Ltd. 5
- Amiot Dumont 1
- Ampersand Press 1
- Ancient And Honorable Artillery Company Of The Masschusetts 1
- Ancient Order Of Foresters 1
- Andersen Press 53
- Andersen Press Ltd. 16
- Anderson Press 1
- Andersons-Edinburgh-Limited 2
- Andover Junction Publications 1
- Andre Deutsch 49
- Andre Deutsch Children's Books 1
- Andred Publishing 1
- Andrew Cole 1
- Andrew Dakers Limited 2
- Andrew Melrose 1
- Andrew Melrose Ltd. 1
- Andrew Reid 1
- Andrew Spottiswoode 1