Publishers
- Coventry University Enterprises Ltd. 1
- Coward-McCann Inc. 1
- CP Press 2
- Crash Media Group 1
- CRC Press 7
- Crecy 1
- Crecy Books 2
- Crecy Publishing Limited 5
- Crescent Books 2
- Cricket Books 1
- Croil 1
- Croner Publications 1
- Croom Helm 9
- Croom Helm Ltd. 1
- Crosby Lockwood 1
- Crosby Lockwood and Son 3
- Crown Publishers 1
- Crown Publishers Inc. 1
- Crowood 3
- Crowswing Books 3
- Crystal Palace Foundation 1
- Cumbrian Railways Association 2
- Cupples & Leon Company 2
- Cushing-Malloy Inc 1
- Cuthell And Martin 2
- Cwmni Cymraeg Foyle 1
- Cwmni Urdd Gobaith Cymru 1
- Cwmni Y. Wasg Eglwysig Gymreig 1
- Cyhoeddedig Gan D. O'Brien Owen 1
- Cyhoeddiadau Barddas 3
- Cyhoeddiadau Mei 1
- Cylch Llyfryddol Caerdydd 1
- Cymdeithas Alawon Gwerin Cymru 1
- Cymric Federation Press 1
- D. & W. Gibbs Ltd. 1
- D. Appleton & Company 2
- D. Appleton And Company 2
- D. Bogue 1
- D. Bradford Barton 15
- D. Brown & Sons Limited 25
- D. Mortimore 1
- D. Reidel Publishing Company 9
- D. Salesbury Hughes 1
- D. Van Nostrand 3
- D. Van Nostrand Company 1
- D. Wyllie & Son 1
- D.Brown & Sons Ltd. 1
- D.C. Thomson & Co Ltd. 71
- D.S. Brewer 1
- D.V. Publications Ltd. 10
- Da Capo Press 2
- Daily Express 279
- Daily Graphic 1
- Daily Herald 2
- Daily Mail 3
- Daily Mirror 12
- Daily Mirror Books 1
- Daily Post 1
- Daily Sketch & Sunday Graphic Ltd. 5
- Daimler-Benz 1
- Dakini Media Ltd 1
- Daldy, Isbister & Co. 1
- Dalesman Books 2
- Dalesman Publishing Company Ltd. 3
- Dalton Watson 9
- Dalton Watson Fine Books 5
- Dana Estes & Company 1
- Daniel O'Connor 2
- Danny Books 1
- Dargaud 1
- Dartmoor Preservation Association 1
- Darton & Co. 3
- Darton And Clark 2
- Darton And Harvey 1
- Darton And Hodge 1
- David & Charles 156
- David Allen & Sons Ltd 1
- David Bennett Books 3
- David Bennett Books Ltd. 3
- David Bogue 2
- David Bridge & Co. Ltd. 1
- David Bull Publishing 1
- David C. Cook Publishing Co. 1
- David Fickling Books 3
- David G. Styles 2
- David Leader 1
- David McKay 1
- David McKay Company 7
- David Nutt 14
- David Ogilvy 1
- David Schutte 9
- David St John Thomas 6
- David Welch 1
- David Weston Publications 1
- Davies And Co. 1
- Davis-Poynter 1
- Dawson 1
- Dawson Publications 1
- Dawsons Of Pall Mall 1
- Day & Son 1