 A & C Black UK | 11 | 1932 - 2012 |
| A & F Publications UK | 1 | 1985 |
 A & W USA | 1 | 1978 |
| A & W MacKenzie UK | 1 | 1896 |
| A & W Publishers USA | 1 | 1979 |
| A & W Visual Library USA | 2 | 1978 |
| A Cappella Books USA | 1 | 1991 |
| A Comet Book UK | 1 | 1987 |
| A Little Big Dreamers USA | 1 | 2023 |
| A Playbill-Ballantine Book USA | 1 | 1970 |
| A Publishing Company International | 1 | 1995 |
| A Taste Of Ink! Inc UK | 1 | 2024 |
| A Way With Media UK | 1 | 2016 |
 A&W Europe | 1 | 1979 |
| A&W Visual Library International | 1 | 1982 |
| A. & F. Pears Ltd. UK | 1 | 1933 |
| A. Brown And Sons UK | 1 | 1978 |
| A. C. Kalmbach And Company USA | 2 | 1934 |
| A. C. Mcclurg & Co. USA | 2 | 1914 - 1916 |
| A. C. McClurg And Co. USA | 1 | 1899 |
| A. D. Innes & Co. UK | 1 | 1897 |
 A. F. Brioso, Jr. Publishing Philippines | 1 | 2022 |
 A. Fayard Et Cie France | 1 | 1934 |
| A. J. B. Fairfax Press UK | 1 | |
| A. L. Burt Company USA | 6 | 1900 - 1922 |
 A. Laumannsche Verlagsbuchhandlung Dülmen (Westfalen) Germany | 1 | 1961 |
| A. M. Witton UK | 1 | 1976 |
| A. Pédone France | 2 | 1939 - 1945 |
| A. R. James UK | 1 | 1995 |
| A. R. Mowbray UK | 1 | 1952 |
| A. Reiff GmbH & Cie. KG Germany | 1 | 1979 |
 A. Roelofs Van Goor, Meppel Netherlands | 1 | 1958 |
| A. S. Barnes & Co. USA | 6 | 1968 - 1981 |
| A. W. Bruna & Zoon Netherlands | 9 | 1961 - 1992 |
| A. W. Bruna Uitgevers Netherlands | 1 | 2017 |
| A. W. Ridley And Co International | 1 | |
| A. Weichert Verlag, Berlin Germany | 4 | 1941 |
| A. Weichert Verlag, Hannover-Berlin Germany | 5 | 1957 - 1979 |
| A. Zwemmer Limited UK | 11 | 1966 - 1971 |
 A.-B. Magn. Bergvalls Förlag Sweden | 1 | 1943 |
| A.-B. Svensk Litteratur Sweden | 1 | 1942 |
 A.H. And A.W. Reed New Zealand | 1 | 1968 |
| A.V.R.R.A.S. Publication UK | 1 | 1979 |
| A.W. Bruna Netherlands | 2 | 2002 - 2008 |
| A.W. Bruna & Zoon Netherlands | 5 | 1965 - 1968 |
| A360media USA | 2 | 2022 - 2023 |
| AA UK | 1 | 2006 |
| AA / Ordnance Survey UK | 2 | 1987 - 1992 |
| AA Command UK | 1 | 1943 |
| AA Publishing UK | 22 | 1992 - 2018 |
| AA Publishing Europe | 1 | 2001 |
| AA Travel Publishing UK | 1 | 2006 |
| AAR USA | 1 | 1986 |
| Aar-Verlag Germany | 1 | 1972 |
 Aardvark-Vanaheim Canada | 5 | 1991 - 1998 |
 Aare Switzerland | 1 | 1983 |
| AB Lindqvists Förlag Sweden | 7 | 1944 - 1958 |
| AB Ljus Förlag Sweden | 1 | 1944 |
| AB Skoglunds Bokförlag Sweden | 1 | 1965 |
| AB Trafik- & Undervisningsmaterial Sweden | 1 | 1985 |
| AB Wisénska Bokhandelns Förlag Sweden | 3 | 1966 - 1975 |
| Abacus International | 5 | 1974 - 1998 |
| Abacus UK | 74 | 1972 - 2016 |
| Abbeville Press USA | 3 | 1987 - 1993 |
| Abbey Library UK | 1 | 1976 |
| Abbey Library, London UK | 1 | |
| Abbey Road Café UK | 1 | 2000 |
| Abbeydale Press UK | 2 | 2000 - 2009 |
 ABC Books Australia | 2 | 2005 - 2014 |
| ABC Music Australia | 1 | |
| ABC-CLIO USA | 2 | 2003 - 2006 |
| Abdo & Daughters USA | 1 | 1989 |
| Abel & Müller, Leipzig Germany | 1 | 1927 |
| Abelard USA | 3 | 1952 - 1953 |
| Abelard-Schuman UK | 4 | 1960 - 1975 |
 Abeona Romania | 2 | 1992 |
| Abgeordnetenhaus Berlin Germany | 1 | 2012 |
| Abingdon-Cokesbury Press USA | 1 | 1953 |
| Abiogenesis Press UK | 3 | 2000 - 2005 |
| Abraham Melzer Verlag Germany | 1 | 2004 |
| Abrams USA | 8 | 1972 - 2019 |
| Abrams International | 1 | 2015 |
| Abrams ComicArts USA | 1 | 2013 |
| Abrams Image USA | 4 | 2011 - 2021 |
| Abrams Press International | 1 | 2020 |
| Absolute Press UK | 5 | 1999 - 2015 |
| Abstract Sounds UK | 2 | 2010 - 2011 |
| Abstract Sounds Publishing UK | 1 | 1999 |
| AC Publishing UK | 1 | 2014 |
 AC Quarelli Italy | 1 | 1999 |
 Academia Czech Republic | 3 | 2014 - 2016 |
| Academia USSR | 4 | 1932 - 1936 |
| Academic Industries USA | 7 | 1984 |
| Academy Chicago USA | 2 | 1982 - 1994 |
| Academy Editions UK | 2 | 1978 - 1989 |
| Academy Press Limited USA | 1 | 1977 |
| ACC Art Books UK | 4 | 2018 - 2021 |
| ACC Art Books USA | 2 | 2020 |
| ACC Editions UK | 2 | 2017 - 2018 |
| Accademia Italy | 1 | 1973 |
| Acclaim Press USA | 2 | 1997 - 2014 |
| Accoutrements USA | 1 | 2014 |
| Ace USA | 1309 | 1953 - 2022 |
| Ace UK | 22 | 1958 - 1962 |
| Ace Books USA | 191 | 1953 - 2016 |
| Ace Charter USA | 11 | 1981 - 1982 |
| Ace Fantasy Books USA | 7 | 1983 - 2006 |
| Ace Science Fiction USA | 16 | 1978 - 2010 |
| Ace Star USA | 5 | 1962 - 1970 |
| Ace/Stoneshire Books UK | 6 | 1983 - 1984 |
| ACG Books Canada | 1 | 1999 |
| Achalm-Jugendbuch-Verlag Reutlingen Germany | 1 | |
| Achievements UK | 1 | 1966 |
| Acid Jazz UK | 1 | 1995 |
| Acid Test Productions USA | 1 | 1997 |
| ACM Retro UK | 1 | 2009 |
| Acorn UK | 1 | 2014 |
| Acropolis Book Ltd. USA | 1 | 1972 |
| Actes Sud / Leméac France | 1 | 1996 |
| Action Lab USA | 4 | 2019 - 2020 |
| Ad Lib Publishers USA | 1 | 2022 |
 Ada Ukraine | 1 | 1992 |
| ADAC Verlag Germany | 3 | 1953 - 1980 |
| Adam & Charles Black UK | 3 | 1897 - 1942 |
| Adam And Charles Black UK | 1 | 1903 |
| Adam Gordon UK | 1 | 2006 |
| Adam Kraft Verlag Germany | 2 | 1993 |
| Adam Reitze Verlag, Hamburg Germany | 1 | 1959 |
| Adams USA | 1 | 2017 |
| Adams Media USA | 9 | 1996 - 2019 |
| Adave USA | 1 | 2024 |
 Addix Bulgaria | 2 | 2011 |
| Adelita UK | 1 | 2010 |
 Adelita Ltd China | 1 | 2010 |
| Adelphi Italy | 23 | 1983 - 2015 |
| Aden Bowman Collegiate Canada | 4 | 1984 - 1987 |
| Adequate Life Publishing USA | 2 | 2016 - 2017 |
| Adevărul Romania | 6 | 2005 - 2011 |
| Administration Des Monnaies Et Médailles France | 1 | 1956 |
| Adolf Bong & Comp. Germany | 1 | 1890 |
| Adolf Sponholtz Verlag, Hannover Germany | 2 | 1962 |
| Adprint UK | 1 | 1957 |
| Advance Publishers USA | 4 | 2004 |
| Advent USA | 1 | 1969 |
| Advent - Verlag Germany | 1 | |
| Adventurers Club UK | 1 | 1967 |
| Adventures Unlimited Press USA | 3 | 1995 - 1999 |
| Adworld International AB Sweden | 1 | 1996 |
| Aero Materiel AB Sweden | 3 | 1960 - 1962 |
| Aeronaut USA | 3 | 2018 - 2019 |
| Aeronaut Books USA | 1 | 2020 |
 AFA Denmark | 1 | 2015 |
| AFCEA International Press USA | 1 | 1984 |
 AFHA Spain | 1 | 1977 |
| AFRHC France | 3 | 2017 - 2018 |
| Afrika-Verlag, Freiburg Im Breisgau Germany | 1 | |
| After The Battle UK | 1 | 1989 |
| Afûk Netherlands | 1 | 2024 |
 AG ReNatur Poland | 1 | 2021 |
| Agentur Des Rauhen Hauses Hamburg Germany | 1 | 1998 |
| Agon Verlag Germany | 1 | 1996 |
| Agora UK | 1 | 2019 |
| Agrippina Verlag, Köln Germany | 2 | |
| Agrippina-Bücherei, Wiesbaden Germany | 1 | |
| Aguilar Spain | 2 | 1958 - 1987 |
 Aguilar, Altea, Taurus, Alfaguara, S.A. Mexico | 1 | 1998 |
| Åhlen & Åkerlunds Förlags A.-B. Sweden | 3 | 1920 - 1957 |
| Åhlen & Åkerlunds Förlags AB Sweden | 1 | 1972 |
| Åhlen & Åkerlunds Förlags AB / Albert Bonnier Sweden | 3 | 1930 - 1956 |
| Åhlén & Söners Förlag Sweden | 3 | 1937 - 1958 |
| Ährenleseverlag, Bern Switzerland | 1 | |
| Air Commando Association Press USA | 1 | 2021 |
| Airlife UK | 2 | 2002 - 2004 |
| Airline Publications UK | 2 | 1981 |
| Airmont USA | 36 | 1962 - 1976 |
| AK Books USA | 6 | 2014 - 2017 |
| AK Press USA | 2 | 1995 - 2011 |
| Akantus Sweden | 1 | 2004 |
| AKFG France | 1 | 2018 |
 Akkord Hungary | 1 | 1997 |
| Aktiebolaget Hiertas Bokförlag Sweden | 1 | 1894 |
| Aktiebolaget Skoglunds Bokförlag Sweden | 1 | 1954 |
| Aktuell-Verlag Germany | 1 | 1972 |
| Alacràn Edizioni Italy | 1 | 2009 |
| Aladdin USA | 6 | 1986 - 2006 |
| Aladdin M!x USA | 11 | 2009 - 2013 |
| Aladdinklubben / Folket I Bilds Förlag Sweden | 1 | 1958 |
| Alan Clark Productions USA | 1 | 1981 |
| Alan Keen UK | 1 | 1966 |
| Alan Sutton Publishing UK | 9 | 1980 - 1998 |
| Albatros Czech Republic | 2 | 1996 - 2006 |
| Albatros Czechoslovakia | 8 | 1969 - 1991 |
| Albatros Romania | 97 | 1970 - 1990 |
| Albert & Charles Boni USA | 1 | 1924 |
| Albert Bonniers Förlag Sweden | 152 | 1907 - 2023 |
| Albert Heijn Netherlands | 4 | 2020 |
| Albert Langen / Georg Müller Verlag, München Germany | 3 | 1935 - 1942 |
| Albert Langen, München Germany | 1 | 1924 |
| Albert Müller Verlag, AG., Rüschlikon-Zürich Switzerland | 6 | 1975 |
| Alberta Council Girl Guides Of Canada Canada | 1 | 1968 |