 H Bauer Publishing UK | 1 | 2024 |
 H&M Productions USA | 3 | 1992 - 1997 |
| H&S Media USA | 1 | 1995 |
 H. Aschehoug And Co. Norway | 4 | 1933 - 2014 |
 H. Fikentscher Verlag, Leipzig Germany | 1 | |
| H. H. Nölke Verlag Germany | 1 | 1947 |
 H. Meulenhoff Netherlands | 1 | 1935 |
| H. Neubert GmbH Germany | 1 | 1983 |
| H. S. Crocker Co., Inc. USA | 1 | |
| H. Wigankov Verlagsanstalt, Berlin Germany | 1 | 1948 |
| H.C. Blossom UK | 2 | 1991 |
| H.F. Ullmann Germany | 1 | 2008 |
| H.F. Ullmann Netherlands | 1 | 2008 |
| H.J.W. Becht Netherlands | 1 | 1994 |
| H.P. Leopolds Uitgeversmij N.V. Netherlands | 2 | 1963 - 1964 |
 H:Ström Sweden | 1 | 2007 |
| Haags Gemeentemuseum Netherlands | 1 | 1989 |
 Hachette France | 7 | 1952 - 2011 |
| Hachette UK | 1 | 2025 |
 Hachette Australia Australia | 2 | 2013 - 2014 |
| Hachette Bibliothèque Verte France | 1 | 1965 |
| Hachette Books USA | 12 | 1998 - 2023 |
 Hachette Books Ireland Ireland | 1 | 2010 |
| Hachette Jeunesse France | 1 | 1993 |
| Hachette Littératures France | 2 | 1999 - 2003 |
| Hachette Réalités France | 1 | 1981 |
| Hachette/R.T.L. France | 1 | 1982 |
| Hädecke Germany | 2 | 1989 - 2001 |
| Hadley USA | 1 | 1947 |
| Hadley Rille Books USA | 1 | 2015 |
 Haffmans Switzerland | 65 | 1987 - 2001 |
| Haffmans Germany | 1 | 1988 |
| Haffmans Und Tolkemitt Germany | 3 | 2012 - 2016 |
| Haffmans Verlag Bei Zweitausendeins Germany | 5 | 2006 - 2014 |
 Haga Shoten Japan | 2 | 1977 - 1981 |
 Hagios Press Canada | 1 | 2013 |
| Haidhausen Verlag Germany | 1 | 1988 |
| Haidhauser Dokumentationsverlag Germany | 1 | 1985 |
 Hakibbutz Hameuchad Publishing House Israel | 1 | 2003 |
| Hakluyt Society UK | 1 | 1879 |
| Hal Leonard USA | 26 | 1978 - 2012 |
| Halcyon House USA | 1 | 1937 |
| Halesowen Press UK | 1 | 2023 |
| Half Pint Press USA | 2 | 2014 - 2018 |
| Hallberg Verlag Germany | 1 | |
| Hallewell Pocket Walks UK | 5 | 2005 - 2017 |
| Hallmark Children's Editions USA | 1 | |
| Halsgrove UK | 1 | 2012 |
| Hamana USA | 1 | 2020 |
| Hamilton & Co UK | 3 | 1951 - 1953 |
| Hamilton (Stafford) UK | 1 | 1964 |
| Hamish Hamilton UK | 36 | 1944 - 2019 |
| Hamish Hamilton Australia | 1 | 1946 |
 Hamlet Denmark | 1 | 1985 |
| Hamlyn International | 5 | 1974 - 2018 |
| Hamlyn UK | 79 | 1968 - 2021 |
| Hamlyn / Arrow UK | 1 | 1984 |
| Hamlyn / Cadbury UK | 1 | 1984 |
| Hamlyn / W H Smith UK | 1 | 1981 |
| Hamlyn Paperbacks UK | 45 | 1978 - 1985 |
| Hamlyn Publishing Group Limited UK | 1 | 1969 |
| Hammond Almanac USA | 1 | 1979 |
| Hammond Hammond UK | 2 | 1942 - 1953 |
| Hammond Incorporated USA | 1 | 1967 |
| Hampstead Garden Suburb Residents Association UK | 1 | 1977 |
| Hampton Roads USA | 1 | 1989 |
| Hampton Roads Publishing USA | 1 | 2003 |
| Hancock House International | 1 | 1995 |
| Handi-Books USA | 8 | 1943 - 1951 |
| Handy Rotary Series USA | 1 | 1980 |
| Hangman's House USA | 1 | |
| Hanibal Germany | 3 | 2001 - 2021 |
 Hannibal Austria | 35 | 1986 - 2022 |
| Hannibal Germany | 3 | 1997 - 2021 |
| Hanover Books UK | 1 | 1971 |
| Hanover Square Press USA | 1 | 2023 |
| Hans Carl Verlag, Nürnberg Germany | 4 | 1955 - 1972 |
| Hans Christians Verlag, Hamburg Germany | 1 | 1957 |
| Hans E. Günther Verlag Germany | 1 | 1972 |
| Hans Köhler Verlag, Hamburg Germany | 2 | 1932 - 1938 |
| Hans Schneider Germany | 1 | 1998 |
| Hans Witte Germany | 1 | 1957 |
| Hans-Jörg Fischer-Verlag Germany | 2 | 1939 - 1940 |
| Hanseatische Verlagsanstalt, Hamburg Germany | 4 | 1940 - 1941 |
| Hansen Mejlgade Denmark | 1 | 2004 |
| Hanser Berlin Germany | 5 | 1997 - 2022 |
| Hanson USA | 1 | 1991 |
| Happy About USA | 1 | 2008 |
| Happy House USA | 1 | 1983 |
| Harborough UK | 3 | 1948 - 1953 |
| Harbour UK | 1 | 2006 |
| Harcourt UK | 1 | 1976 |
| Harcourt USA | 5 | 2002 - 2008 |
| Harcourt Books USA | 2 | 1999 - 2001 |
| Harcourt, Brace & Company USA | 10 | 1924 - 1998 |
| Harcourt, Brace & World USA | 9 | 1960 - 1969 |
| Harcourt, Brace, Jovanovitch USA | 7 | 1975 - 1993 |
| Hard Case Crime USA | 80 | 2004 - 2021 |
| Hard Case Crime UK | 3 | 2007 - 2018 |
| Hardie Grant Australia | 6 | 2001 - 2018 |
| Hardie Grant Books UK | 3 | 2013 - 2015 |
| Hardshell Publishing Australia | 1 | 2016 |
| Harenberg Germany | 3 | 1979 - 1995 |
| Harlekin Sweden | 1 | 1979 |
| Harlequin USA | 1 | 1952 |
| Harlequin Sweden | 4 | 2002 - 2013 |
| Harlequin Canada | 1 | 1956 |
| Harlequin Books Canada | 8 | 1950 - 1958 |
| Harlequin MIRA UK | 2 | 2013 |
| Harley-Davidson USA | 1 | 1989 |
| Harlin Quist USA | 1 | 1968 |
| Harmony USA | 26 | 1977 - 2014 |
| Harmony Books USA | 2 | 2001 |
| Härnösands Stadsfullmäktige Sweden | 2 | 1935 - 1945 |
| Härnösands Stift Sweden | 5 | 1941 - 1987 |
| Harold Hare's Own Paper UK | 1 | |
| Harold Shaw Publishers USA | 1 | 1976 |
| Harper UK | 47 | 2006 - 2017 |
| Harper USA | 85 | 1993 - 2023 |
| Harper & Brothers USA | 12 | 1855 - 1961 |
| Harper & Brothers International | 1 | 1909 |
| Harper & Row USA | 52 | 1944 - 1990 |
| Harper Collins UK | 276 | 1993 - 2024 |
| Harper Collins USA | 43 | 1960 - 2018 |
| Harper Collins Canada | 2 | 1999 - 2017 |
| Harper Collins Australia | 3 | 2009 - 2017 |
 Harper Collins New Zealand | 1 | 2016 |
 Harper Collins India | 2 | 2017 - 2019 |
| Harper Collins / Science Fiction Book Club USA | 1 | 2007 |
| Harper Collins / Voyager UK | 19 | 1996 - 2024 |
| Harper Collins Childrens Books UK | 2 | 2008 - 2009 |
| Harper Collins ItBooks USA | 1 | 2011 |
| Harper Colophon Books USA | 3 | 1968 - 1984 |
| Harper Design USA | 9 | 2012 - 2021 |
| Harper Element UK | 1 | 2008 |
| Harper Entertainment USA | 5 | 2004 - 2006 |
| Harper Entertainment UK | 1 | 2000 |
| Harper Festival USA | 1 | 2017 |
| Harper Flamingo USA | 1 | 1999 |
| Harper One USA | 1 | 2013 |
| Harper Paperbacks USA | 6 | 1990 - 1996 |
| Harper Perennial UK | 18 | 2004 - 2008 |
| Harper Perennial USA | 17 | 1993 - 2024 |
| Harper Perennial Canada | 3 | 1997 - 2019 |
| Harper Press UK | 4 | 2007 - 2012 |
| Harper Prism USA | 8 | 1995 - 2000 |
| Harper Resource USA | 1 | 2003 |
| Harper Sport UK | 3 | 2007 - 2009 |
| Harper Torch USA | 3 | 2001 - 2005 |
| Harper Torchbooks USA | 3 | 1960 - 1976 |
| Harper Trophy USA | 6 | 2001 - 2009 |
| Harper Voyager UK | 43 | 2002 - 2018 |
| Harper Voyager USA | 1 | 2023 |
| Harper's Magazine Press USA | 1 | 1974 |
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| HarperCollins USA | 22 | 1955 - 2019 |
| HarperCollins International | 4 | 1993 - 2011 |
| HarperCollins UK | 26 | 1992 - 2021 |
| HarperCollins Germany | 7 | 2020 - 2024 |
| HarperCollins Sweden | 4 | 2019 - 2021 |
| HarperCollins / Voyager UK | 2 | 1996 - 1998 |
| HarperCollins Children's Books UK | 6 | 1994 - 2013 |
| HarperCollins Publishers USA | 16 | 1968 - 2009 |
| HarperCollins Science Fiction & Fantasy UK | 2 | 1993 |
| HarperCollins West USA | 1 | 1995 |
| HarperCollinsNordic Sweden | 6 | 2017 - 2021 |
| HarperCollinsPublishers UK | 24 | 1992 - 2021 |
| HarperCollinsPublishers USA | 2 | 1972 - 2020 |
| HarperCollinsPublishers / Grafton UK | 2 | 1992 - 1993 |
| HarperCollinsPublishers / Voyager UK | 3 | 1995 - 2000 |
| HarperEntertainment International | 1 | 2000 |
| HarperFestival USA | 6 | 2008 |
| HarperLuxe USA | 2 | 2018 - 2020 |
| HarperNorth UK | 1 | 2023 |
| HarperPerennial USA | 9 | 1991 - 2007 |
| HarperPrism USA | 5 | 1996 - 1999 |
| HarperSanFrancisco USA | 3 | 1992 - 2006 |
| HarperSpotlight USA | 1 | 1997 |
| HarperTeen USA | 1 | 2009 |
| Harpertorch USA | 6 | 2002 - 2005 |
| Harpervoyager UK | 1 | 2009 |
| Harr Wagner Publishing Company USA | 1 | 1933 |
| Harrap UK | 5 | 1972 - 1987 |
| Harriers Förlag Sweden | 2 | 1950 - 1960 |
| Harries Germany | 1 | 2003 |
| Harrison And Sons UK | 1 | 1930 |
| Harrison House USA | 1 | 1979 |
| Harrow Books USA | 1 | 1973 |
| Harry N. Abrams USA | 18 | 1960 - 2024 |
| Harry N. Abrams, Inc. USA | 5 | 1977 - 2002 |
| Hart USA | 1 | 1969 |
| Hart-Davis, MacGibbon UK | 5 | 1973 - 1979 |
| Harth Publishing USA | 1 | 2011 |
| Harvard Business Review Press USA | 1 | 2024 |
| Harvard Common Press USA | 1 | 1983 |
| Harvard University Press USA | 7 | 1920 - 2004 |
| Harvest USA | 1 | 1999 |
| Harvest/HBJ USA | 2 | 1978 - 2002 |
| Harvill UK | 2 | 1992 - 2002 |
| Harvill Press UK | 8 | 1984 - 2006 |