Publishers
- K. & R. Books Ltd. 2
- K. Gandy 1
- Kaisei-Sha Co. 1
- Kales Press 1
- Kalmbach Books 1
- Kangaroo Press 2
- Karl Baedeker 4
- Karl Prochaska 1
- Kattenkabinet 1
- Kay Townsend 2
- Kaye & Ward 7
- Kaye & Ward Ltd. 17
- Kegan Paul, Trench, Trubner & Co. 3
- Kegan Paul, Trench, Trubner & Co. Ltd. 5
- Kelly & Co. 1
- Kelly's Directories Ltd. 8
- Kemsley Newspapers 1
- Ken Publications 1
- Kenneth Mason 2
- Kenneth Saville 1
- Kent & Co. 1
- Kent Archaeological Society 1
- Kent Field Club 1
- Kershaw Publishing Company Limited 1
- Kessinger Publishing 1
- Kestrel Books 41
- Kettlewell Transportation Information Trade Services 3
- Kevin Francis 1
- Key Porter Books 2
- Key Publishing 1
- Khl International Ltd 1
- Kibworth Books 1
- Kidderminster Railway Museum 1
- King Alfred Books 1
- King's College Cambridge 1
- Kingfisher 3
- Kingfisher Books 1
- Kingfisher Railway Productions 1
- Kingsmead Reprints 4
- Kitchener House-Publishers 1
- Kluwer 1
- Kluwer Academic Publishers 5
- Knightsbridge Publications 2
- Knowledge Publications 1
- Knowledge World 1
- Kober C.F. Spittlers Nachfolger 1
- Kodansha International Ltd. 2
- Kogan Page 5
- Konark Publishers 1
- Konemann 6
- Kookaburra Technical Publications 2
- Kopec Eber Publishing Llc 1
- Kosler Verlag Koln 1
- Kozdok 1
- Kp Books 1
- Kpi Limited 1
- Krause Publications 2
- Ktav Publishing House 1
- Kunstsammlung Nordrhein-Westfalen 1
- Kurt Metzner 1
- Kuwait University 1
- Kyle Cathie Limited 1
- Kynos Verlag 2