Publishers
- Country Life Books 2
- Country Life Limited 12
- Country Life Ltd. 8
- Countryside Books 5
- Countrywide Editions Ltd 1
- County Observer Printing Works 1
- Courier-Herald Printers 1
- Courtauld Institute Of Art Gallery 1
- Coventry University Enterprises Ltd. 1
- Coward-McCann Inc. 1
- CP Press 2
- Crash Media Group 2
- Crawford Art Gallery 1
- Crawley Local History Group 1
- CRC Press 12
- Crecy 4
- Crecy Books 3
- Crecy Publishing Limited 9
- Creel Press 1
- Cresset Editions 1
- Cricket Books 1
- Croesor Junction Press 1
- Croil 1
- Croner Publications 1
- Croom Helm 8
- Croom Helm Ltd. 1
- Crosby Lockwood 1
- Crosby Lockwood and Son 5
- Crosby Lockwood And Son Ltd 1
- Cross And Jackman 1
- Crossprint 1
- Crown Publishers 2
- Crown Publishers Inc. 5
- Crowood 1
- Crowswing Books 2
- Crystal Harrison 1
- Crystal Palace Foundation 1
- Csiro Publishing 1
- Cumberland & Westmorland Antiquarian & Archaeological Society 10
- Cumbrian Railways Association 1
- Cupples & Leon Company 1
- Curwen Books 1
- Cushing-Malloy Inc 1
- Cwmbran Community Press Ltd. 1
- Cwmni Cymraeg Foyle 1
- Cwmni Urdd Gobaith Cymru 1
- Cwmni Y. Wasg Eglwysig Gymreig 1
- Cyhoeddedig Gan D. O'Brien Owen 1
- Cyhoeddiadau Barddas 2
- Cymric Federation Press 1
- D. Appleton & Company 2
- D. Appleton And Company 3
- D. Bradford Barton 19
- D. Brown & Sons Limited 27
- D. Mortimore 1
- D. Reidel Publishing Company 6
- D. Van Nostrand 1
- D. Van Nostrand Company 1
- D. Wyllie & Son 1
- D.C. Thomson & Co Ltd. 43
- D.V. Publications Ltd. 10
- D.W. Willoughby E.R. Oakley 1
- Da Capo Press 2
- Dahne Verlag 1
- Daily Express 242
- Daily Graphic 1
- Daily Herald 2
- Daily Mail 2
- Daily Mirror 7
- Daily Mirror Books 1
- Daily Post 1
- Daily Sketch & Sunday Graphic Ltd. 5
- Daimler-Benz 1
- Dakini Media Ltd 1
- Dalesman Books 2
- Dalesman Publishing Company Ltd. 2
- Dalrymple & Verdun Publishing 2
- Dalton Watson 10
- Dalton Watson Fine Books 2
- Dana Estes & Company 1
- Daniel O'Connor 1
- Darf Publishers Ltd 1
- Dartmoor Preservation Association 1
- Darton & Co. 3
- Darton And Clark 2
- Dave Watson Solutions Ltd 1
- David & Charles 119
- David Bangs 1
- David Bateman 1
- David Bennett Books Ltd. 1
- David Bogue 1
- David Bridge & Co. Ltd. 1
- David Bull Publishing 3
- David C. Cook Publishing Co. 1
- David Fickling Books 2
- David Fleming 1
- David Harris 1
- David Martin 1
- David McKay 2
- David McKay Company 4