Publishers
- K. & R. Books Ltd. 3
- Kaisei-Sha Co. 1
- Kalmbach Books 1
- Kangaroo Press 2
- Karl Baedeker 2
- Karl Prochaska 1
- Kashi House 1
- Kattenkabinet 1
- Kay Townsend 1
- Kaye & Ward 9
- Kaye & Ward Ltd. 11
- Keats Publishing 1
- Kegan Paul, Trench, Trubner & Co. 2
- Kegan Paul, Trench, Trubner & Co. Ltd. 6
- Keith Reid 1
- Kelly's Directories Ltd. 6
- Kelsey Publishing Ltd 1
- Ken Publications 1
- Ken Trotman Publishing 3
- Kena Publishing 1
- Kennedy's 1
- Kenneth Mason 1
- Kenneth Saville 1
- Kensington Publishing Corp 1
- Kent & Co. 1
- Kent Archaeological Society 1
- Kershaw Publishing Company Limited 1
- Kessinger Publishing 1
- Kestrel Books 33
- Kestrel Railway Books 2
- Kettlewell Transportation Information Trade Services 1
- Kevin Weldon And Associates Pty Ltd 1
- Key Porter Books 2
- Kibworth Books 1
- Kimberley's 1
- King's College Cambridge 1
- Kingfisher 2
- Kingfisher Books 2
- Kingfisher Railway Productions 1
- Kingsmead Press 1
- Kingsmead Reprints 4
- Kitchener House-Publishers 1
- Kitty Publishing 1
- Kluwer Academic Publishers 7
- Knight Books 1
- Knightsbridge Publications 3
- Knowledge Publications 1
- Knowledge World 1
- Kober C.F. Spittlers Nachfolger 1
- Kodansha International Ltd. 3
- Kogan Page 2
- Konark Publishers 1
- Konemann 6
- Kookaburra Technical Publications 3
- Kosler Verlag Koln 1
- Kozdok 1
- Krause Publications 1
- Krb Publications 1
- Ktav Publishing House 1
- Kunstsammlung Nordrhein-Westfalen 1
- Kurt Glemser 3
- Kurt Metzner 1
- Kyle Cathie Limited 2