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- 13 Elements
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- ABC-CLIO
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- Absolute Author Publishing House
- Academic Studies Press
- Academica Press
- Acme Digital
- Adam Podkowa
- Adelphil Consultancy
- Admiral House Publishing
- Adventures Unlimited Press
- Aeressa
- Afnil
- African Perspectives Publishing
- Agency Books
- Agio Publishing House
- Ags Wordsmiths
- Aha! Press a Howard Activity, LLC
- Air World
- Airship 27
- Airship 27 Productions
- AK Press
- Al-Mashreq Ebookstore
- Aladdin Paperbacks
- Alanthereaultauthor
- Alastair Davie
- Aleph Book Company
- Alex Mercer
- Alexander Tetelbaum
- Alexander Vassiliev
- Algonquin Books
- Alistern Press
- Allen & Unwin
- Allison & Busby
- Alpha Edition
- Alpha Group 3 LLC
- Amazing Stories, LLC.
- Amazon Crossing
- Amazon Digital Services LLC - Kdp
- Amazon Publisher Hub
- Amber Publishers Company
- Amberley Publishing
- AMZ Book Publishing Services
- Anam Rasheed
- Anchor Books
- Andalus Publishing
- Andre Deutsch
- Andreas Michaelides
- Andrei Ostalski
- Andrew Kanyuka
- Angels Fortune [editions]
- Anson Street Press
- Anthem Press
- Antimeridian Press
- Any Man Publishing
- Apb Books
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