Publishers
- K. & R. Books Ltd. 2
- K. Gandy 1
- Kaisei-Sha Co. 1
- Kalmbach Books 1
- Kangaroo Press 2
- Karl Baedeker 5
- Karl Prochaska 1
- Katowice-Speyer 1
- Kattenkabinet 1
- Kaye & Ward 8
- Kaye & Ward Ltd. 20
- Kegan Paul, Trench & Co. 1
- Kegan Paul, Trench, Trubner & Co. 3
- Kegan Paul, Trench, Trubner & Co. Ltd. 5
- Kelly & Co. 1
- Kelly's Directories Ltd. 9
- Kemsley Newspapers 1
- Ken Publications 1
- Ken Trotman Publishing 2
- Kenneth Mason 1
- Kenneth Saville 1
- Kent & Co. 1
- Kent Archaeological Society 2
- Kent Field Club 1
- Kent State University Press 1
- Kerin Publishers 1
- Kershaw Publishing Company Limited 1
- Kessinger Publishing 1
- Kestrel Books 42
- Kestrel Railway Books 1
- Kettlewell Transportation Information Trade Services 3
- Key Porter Books 2
- Key Publishing 1
- Kibworth Books 1
- Kidderminster Railway Museum 1
- King's College Cambridge 1
- Kingfisher 3
- Kingfisher Books 2
- Kingfisher Railway Productions 2
- Kingsmead Reprints 5
- Kitchener House-Publishers 1
- Kluwer 1
- Kluwer Academic Publishers 5
- Knight Books 2
- Knightsbridge Publications 3
- Knowledge Publications 1
- Knowledge World 1
- Kober C.F. Spittlers Nachfolger 1
- Kodansha International Ltd. 2
- Kogan Page 5
- Konark Publishers 1
- Konemann 9
- Kookaburra Technical Publications 3
- Kopec Eber Publishing Llc 1
- Kosler Verlag Koln 1
- Kozdok 1
- Kp Books 1
- Kpi Limited 1
- Krause Publications 1
- Ktav Publishing House 1
- Kunstsammlung Nordrhein-Westfalen 1
- Kurt Metzner 1
- Kuwait University 1