 Centraal Museum Utrecht Netherlands | 1 | 2000 |
 Central Electric Railfans' Association USA | 4 | 1976 - 2003 |
| Central Valley Railroad Publications USA | 2 | 1980 - 1982 |
 Centre Georges Pompidou / Hazan France | 1 | 1985 |
| Centre National De La Cinématographie France | 1 | 1984 |
 Centro Di Italy | 1 | 1973 |
 Centum UK | 1 | 2015 |
| Centurion Books USA | 1 | 1977 |
| Century UK | 44 | 1983 - 2024 |
| Century International | 1 | 1992 |
| Century USA | 3 | 1948 - 1950 |
 Century Australia | 1 | 2003 |
| Century 21 Books UK | 5 | 1969 |
| Century 21 Publishing UK | 8 | 1967 - 1969 |
| Century 22 UK | 1 | 1993 |
| Century Co. USA | 2 | 1907 - 1915 |
| Century Hutchinson Ltd UK | 2 | 1987 - 1989 |
| Century Legend UK | 7 | 1988 - 1992 |
| Century Limited UK | 1 | 1995 |
 Ceres Verlag Germany | 3 | 1958 |
| Certqua Germany | 1 | 2022 |
| Československý Spisovatel Czechoslovakia | 3 | 1966 - 1975 |
 CEWE-Förlaget Sweden | 3 | 1978 - 1994 |
 CFC Éditions Belgium | 1 | 2009 |
| CFS Books USA | 1 | 1973 |
 CG Publishing Canada | 1 | 1997 |
| Chainline UK | 2 | 1995 - 1996 |
| Chamberlain USA | 1 | 1954 |
| Chambers UK | 1 | 1996 |
| Chambers Publishing Limited UK | 1 | 1990 |
| Chameleon Books UK | 4 | 1989 - 1999 |
| Champ Vallon France | 1 | 2000 |
| Champions For A Healthy Campus Canada | 1 | 2016 |
| Chancellor Press UK | 10 | 1985 - 2009 |
| Chandler & Sharp USA | 1 | 1976 |
| Chandos UK | 1 | 2004 |
| Channel 4 Books UK | 2 | 1988 - 2001 |
| Chapman And Hall UK | 4 | 1843 - 1912 |
| Chapmans UK | 2 | 1991 - 1992 |
| Chappell UK | 1 | 1957 |
| Chariot Books USA | 5 | 1959 - 1961 |
| Charisma UK | 2 | 1973 - 1975 |
| Charisma Books UK | 1 | 1973 |
| Charles A. Julian USA | 1 | 1970 |
| Charles C Thomas USA | 1 | 1961 |
| Charles E. Tuttle Company International | 4 | 1962 - 1991 |
| Charles H Kerr & Company USA | 1 | 1907 |
| Charles J. Musson Canada | 1 | 1969 |
| Charles Letts & Co UK | 1 | 1991 |
| Charles Mandel France | 1 | 1963 |
| Charles River Editors USA | 3 | 2013 |
| Charles River Press USA | 1 | 2011 |
| Charles Scribner's Sons USA | 44 | 1900 - 1994 |
| Charles Stewart & Company UK | 3 | 1983 - 1985 |
| Charles-Lavauzelle France | 1 | 1979 |
| Charlewood Press UK | 1 | 2003 |
| Charlton International Canada | 1 | 1977 |
| Charta USA | 1 | 2009 |
| Charter USA | 22 | 1978 - 1989 |
| Charter UK | 1 | 1985 |
| Charter Communications, Inc. USA | 3 | 1973 - 1983 |
| Chartwell USA | 11 | 1978 - 2024 |
| Chartwell Books Inc. UK | 1 | 1980 |
| Chateau Lake Louise Canada | 1 | 1927 |
| Chatham Publishing UK | 1 | 2001 |
| Chatham Publishing USA | 9 | 1969 - 1981 |
| Chatham River Press USA | 1 | 1979 |
| Chatto & Windus UK | 32 | 1881 - 2020 |
| Cheam Publishing Canada | 1 | 1970 |
| Checkmark Books USA | 1 | 2001 |
| Chelby X. Zac USA | 1 | 1991 |
| Chelsea House USA | 3 | 1976 - 1977 |
| Chelsea House Publications UK | 1 | 1993 |
| Chemnitzer Verlag Germany | 1 | 2001 |
| Cheona Publications UK | 1 | 2001 |
| Cherche Midi France | 4 | 2012 - 2024 |
| Cherry Lane Books USA | 1 | 1985 |
| Cherry Red UK | 14 | 1997 - 2021 |
| Cherry Tree UK | 12 | 1951 - 1952 |
| Cherry Tree Book (Kemsley Publications) UK | 1 | 1950 |
| Cherry Valley Editions USA | 3 | 1976 - 1989 |
| Cheval Books USA | 2 | 1974 - 1976 |
| Chevron Books USA | 1 | 1967 |
| Chiarelettere Italy | 1 | 2012 |
| Chic Ken UK | 1 | 2001 |
| Chicago Review Press USA | 11 | 1995 - 2024 |
| Chicken House UK | 4 | 2011 - 2014 |
| Chico State University Press USA | 1 | 1980 |
| CHIDUNNIT Canada | 1 | 2015 |
| Children's Golden Library UK | 1 | 2003 |
| Children's Press USA | 4 | 1997 - 2017 |
| Children's Press UK | 1 | 1957 |
| Chiltern Publishing UK | 1 | 2017 |
| Chilton Book Company USA | 9 | 1965 - 1992 |
| Chilton Company - Book Division USA | 1 | 1961 |
| Chimera UK | 1 | 2015 |
| China Studien- Und Verlagsgesellschaft Frankfurt Am Main Germany | 1 | 1985 |
| Chinook Centre Canada | 1 | 2009 |
| Chisman, Bradshaw UK | 1 | 1949 |
| ChooseCo USA | 1 | 2006 |
| Chr. Kaiser Verlag München Germany | 1 | 1959 |
| Chris Andrews Publications UK | 1 | 2003 |
| Christ For The Nations USA | 1 | 1979 |
| Christian Bourgois France | 8 | 1970 - 1997 |
| Christian Crusade Publications USA | 2 | 1965 - 1969 |
| Christian Faith Publishing USA | 1 | 2021 |
| Christian Kaiser Verlag, München Germany | 1 | 1924 |
| Christian Pirot France | 5 | 2002 - 2010 |
 Christian Plus Romania | 3 | 1995 |
| Christian Wegner Verlag Germany | 1 | 1969 |
| Christian Wolff Verlag Germany | 1 | |
| Christian-Verlag, Bad Nauheim Germany | 1 | 1952 |
| Christie's Netherlands | 1 | 2006 |
| Christine Burgin/New Directions USA | 1 | 2016 |
| Christliche Verlagsanstalt, Konstanz Germany | 1 | 1960 |
| Christliches Verlagshaus Germany | 3 | 1958 - 1986 |
 Christoph Merian Verlag Switzerland | 1 | 2001 |
| Christopher Helm UK | 1 | 1990 |
| Christophers UK | 1 | 1942 |
| Christophorus-Verlag Germany | 1 | 1986 |
| Chrome Dreams International | 2 | 2005 - 2006 |
| Chrome Dreams UK | 5 | 2003 - 2005 |
| Chronicle USA | 5 | 1979 - 2012 |
| Chronicle International | 1 | 2005 |
| Chronicle Books USA | 39 | 1985 - 2020 |
| Chronicle Communications London UK | 1 | 1988 |
| Chronik Verlag Germany | 1 | 1987 |
| Chrysalis Children's Books UK | 2 | 1991 - 2003 |
| Chrysalis Impact UK | 2 | 2002 |
| Churchill Livingstone UK | 1 | 1990 |
| Cicada UK | 2 | 2013 - 2015 |
 Cicero Denmark | 2 | 2004 - 2008 |
| Cicero Romania | 1 | 1993 |
| Cicerone UK | 3 | 1994 - 2018 |
| Cicerone Press UK | 1 | 1987 |
| Cico Books UK | 1 | 2013 |
| CIE Italy | 1 | 1992 |
 Ciela Bulgaria | 6 | 2008 - 2022 |
| CIN-DAV, Inc. USA | 1 | 1991 |
| Cinebook International | 1 | 2007 |
| Cinebook UK | 1 | 2007 |
| Cinémathèque Royale De Belgique Belgium | 1 | 1975 |
| Cinephiles Press UK | 1 | 2018 |
 Círculo De Lectores Spain | 2 | 1972 - 1973 |
 Círculo De Leitores Portugal | 1 | 1976 |
| Círculo Rojo Spain | 1 | 2018 |
| Ciro Ediciones, S.A. Spain | 6 | |
| Citadel Press USA | 35 | 1965 - 2024 |
| Citadel Underground USA | 1 | 1990 |
| Citadelles Et Mazenod France | 1 | 2020 |
 Citibank Greece | 1 | 1984 |
| City France | 1 | 2011 |
| City Editions France | 4 | 2004 - 2015 |
| City Lights USA | 2 | 2011 |
| City Lights Books USA | 10 | 1970 - 2006 |
| City Magazines UK | 3 | 1967 - 1969 |
| City Of Airdrie Canada | 1 | 2009 |
| City Of London Phonograph And Gramophone Society Ltd UK | 23 | 1985 - 2017 |
| City Of Prince Albert Canada | 1 | 1976 |
| City Of Saskatoon Municipal Heritage Advisory Committee Canada | 1 | 2002 |
| City Of Saskatoon Parks And Recreation Department Canada | 1 | 1981 |
| Claasen Germany | 1 | 2023 |
| Claassen Verlag, München Germany | 2 | 2000 - 2001 |
| Claire Marie USA | 1 | 1914 |
| Clairmont Corp. USA | 1 | 1969 |
| Clairview UK | 1 | 2023 |
| Clanose Publishers UK | 1 | 1974 |
| Clap Production Hagen Germany | 1 | 1995 |
| CLARB France | 2 | 1986 - 1987 |
| Claremont Records UK | 1 | 1982 |
| Clarendon Press UK | 12 | 1909 - 1998 |
| Clarion Books USA | 1 | 2009 |
| Clarke, Irwin & Company Canada | 1 | 1968 |
| Clarksdale UK | 2 | 2011 - 2012 |
| Clarkson N. Potter Inc. USA | 1 | 1975 |
| Clasic Romania | 1 | 1994 |
| Classic Press, Incorporated USA | 1 | 1968 |
| Classic Publications USA | 1 | 1968 |
| Classic Publishing Corporation USA | 1 | 1970 |
| Classic Rock Society UK | 1 | 2015 |
| Classics Book Club UK | 1 | 1953 |
| Classics Lektuur Netherlands | 1 | 1976 |
| Classiques Garnier France | 1 | 2011 |
| Claudius Verlag Germany | 1 | 2019 |
| Clausen & Bosse Germany | 1 | 1998 |
| Clausen Bøger Denmark | 1 | 1986 |
| Claycomb Press, Inc. USA | 1 | 1987 |
| Clays Ltd. UK | 1 | 2020 |
| CLB International UK | 1 | 1999 |
| Cleaver-Hume Press UK | 1 | 1952 |
| Clément Guilhamou France | 1 | 1942 |
| Cleopatra USA | 2 | 1994 - 2015 |
| Cleveland Petroleum Company Limited UK | 1 | 1972 |
| Cliff Street Books USA | 1 | 2001 |
| Clifton Books UK | 1 | 1969 |
| Clink Street Publishing UK | 2 | 2020 |
| Clive Woodyear UK | 2 | 2005 - 2007 |
| Clover Books USA | 1 | |
| Club Degli Editori Italy | 68 | 1873 - 1984 |
| Club Express France | 1 | 1983 |