Publishers
- Aidu(raf) 1
- Aip Press 1
- Air Britain 1
- Air Crew Association 1
- Air Force History & Museums Program 2
- Air Historical Branch (raf) 1
- Air Ministry 1
- Air Museum Publications (york) Ltd 1
- Air Review Ltd. 2
- Air University Press 1
- Air-Britain 1
- Air-Britain (historians) Ltd. 15
- Aircraft Technical Publications Limited 1
- Airfield Publications 1
- Airlife 55
- Aj-Press 1
- Aladdin Books 1
- Alain De Gourcuff Editeur 1
- Alan Brown 1
- Alan Leech 1
- Alan Sutton 52
- Alaska Northwest Publishing Company 1
- Albatros Productions Ltd. 3
- Albert E. Marriott 2
- Albert Whitman & Company 1
- Albion House 3
- Albyn Press 1
- ALD Design & Print 1
- Alden & Company Limited 1
- Alden Press 3
- Aldine Books 1
- Aldine Publishing Company 1
- Aldus Books 1
- Alec Tiranti 1
- Alecto Historical Editions 1
- Alex Hogg 1
- Alexander Gardner 2
- Alexander Maclehose & Co. 2
- Alexander Moring Ltd. 3
- Alexander Strahan 1
- Alf Cooke Ltd. 6
- Alfred A. Knopf 7
- Alfred A. Knopf, Inc. 1
- Alfred Hahns 1
- Alfred Mame Et Fils 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 7
- Allenson & Co. Ltd. 1
- Allison & Busby 1
- Alloway 1
- Allyn & Bacon 2
- Allyn and Bacon Inc. 1
- Almark Publishing Co. Ltd. 5
- Almquist & Wiksells 1
- Alpha Science International Limited 1
- Alphabooks 1
- Alpine 1
- Alpine Fine Arts Collection 2
- Alpine Publications, Inc. 1
- Alston Rivers Ltd. 1
- Altitude Publishing 1
- Amadeus Press 1
- Amazon Publications 5
- Amber Books 2
- Amberley 17
- Amberley Publishing 6
- American Asssociation For The Advancement Of Science 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
- Ammo Boks 1
- Ampersand Press 1
- Amulree Publications 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 47
- Andre Deutsch Children's Books 2
- Andred Publishing 1
- Andrew Cole 1
- Andrew Dakers Limited 4
- Andrew Jenkins 1
- Andrew Melrose 1
- Andrew Spottiswoode 1