Publishers
- Constable & Co. Ltd. 13
- Constable and Company Ltd. 16
- Constable Young Books 1
- Constable Young Books Ltd. 1
- Continuum 2
- Conway 3
- Conway Maritime Press 35
- Copernicus 1
- Coppenrath 1
- Copple House Books 1
- Cork University Press 1
- Cornell University Press 3
- Cornish Brothers Limited 3
- Cornmarket 1
- Cornstalk Publishing 1
- Corvina 1
- Cosmopolitan Book Corporation 1
- Cote D'Or 1
- Coterie Press Limited 3
- Council For British Archaeology 2
- Council Of Museums In Wales 1
- Country Life 18
- Country Life Books 2
- Country Life Limited 9
- Country Life Ltd. 7
- Countryside Books 4
- Countrywide Editions Ltd 1
- Courage Books 1
- Courtauld Institute Of Art Gallery 1
- Coventry University Enterprises Ltd. 1
- Coward-McCann Inc. 1
- CP Press 2
- Cranham Local History Society 1
- Crash Media Group 2
- Crawford Art Gallery 1
- CRC Press 14
- Crecy 3
- Crecy Books 3
- Crecy Publishing Limited 7
- Creel Press 1
- Cresset Editions 2
- Cricket Books 1
- Croesor Junction Press 1
- Croil 1
- Croner Publications 1
- Croom Helm 6
- Crosby Lockwood 1
- Crosby Lockwood and Son 3
- Crosby Lockwood And Son Ltd 1
- Crossprint 1
- Crown Publishers 1
- Crown Publishers Inc. 2
- Crowswing Books 2
- Crystal Palace Foundation 1
- Culture Et Civilisation, Bruxelles 1
- Cumberland & Westmorland Antiquarian & Archaeological Society 7
- Cupples & Leon Company 2
- 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 1
- D. Appleton And Company 3
- D. Bradford Barton 19
- D. Brown & Sons Limited 24
- D. Mortimore 1
- D. Reidel Publishing Company 5
- D. Van Nostrand 1
- D. Wyllie & Son 1
- D.C. Thomson & Co Ltd. 79
- D.V. Publications Ltd. 10
- D.W. Willoughby E.R. Oakley 1
- Da Capo Press 1
- Dahne Verlag 1
- Daily Express 232
- Daily Graphic 1
- Daily Herald 2
- Daily Mail 2
- Daily Mirror 7
- Daily Mirror Books 1
- Daily News 1
- Daily Post 1
- Daily Sketch & Sunday Graphic Ltd. 3
- Daimler-Benz 1
- Dakini Media Ltd 1
- Dalesman Books 1
- Dalesman Publishing Company Ltd. 2
- Dalrymple & Verdun Publishing 1
- Dalton Watson 7
- Dalton Watson Fine Books 2
- Dana Estes & Company 1
- Daniel O'Connor 1
- Darf Publishers Ltd 1
- Dartmoor Preservation Association 1
- Darton & Co. 3