Publishers
- Croner Publications 1
- Croom Helm 7
- Croom Helm Ltd. 2
- Crosby Lockwood 1
- Crosby Lockwood and Son 3
- Crossley And Clarke 1
- Crown Publishers 1
- Crown Publishers Inc. 2
- Crowood 3
- Crowswing Books 3
- Crystal Clear Publications Ltd 1
- Culross Printers Coupar Angus 1
- Cupples & Leon Company 2
- Curzon Press 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
- Cycling Offices 1
- Cyhoeddedig Gan D. O'Brien Owen 1
- Cyhoeddiadau Barddas 3
- Cyhoeddwyd Gan Isaac Foulkes 1
- Cylch Llyfryddol Caerdydd 1
- Cymdeithas Alawon Gwerin Cymru 1
- Cymric Federation Press 1
- D. & W. Gibbs Ltd. 1
- D. Appleton & Company 3
- D. Appleton And Company 2
- D. Bradford Barton 10
- D. Brown & Sons Limited 28
- D. Mckenzie 1
- D. Mortimore 1
- D. Reidel Publishing Company 9
- D. Van Nostrand 5
- D. Wyllie & Son 1
- D.A.P. Distributed Art Publishers Inc. 1
- D.Brown & Sons Ltd. 1
- D.C. Thomson & Co Ltd. 133
- D.K. & M.N. Sandford 1
- D.L.M.S. 1
- D.V. Publications Ltd. 11
- D400 Fund 1
- Da Capo Press 2
- Daily Express 344
- Daily Graphic 1
- Daily Herald 2
- Daily Mail 4
- Daily Mirror 13
- Daily Post 1
- Daily Sketch & Sunday Graphic Ltd. 6
- Daimler-Benz 1
- Dakini Media Ltd 1
- Daldy, Isbister & Co. 1
- Dalen 1
- Dalesman Books 1
- Dalesman Publishing Company Ltd. 2
- Dalton Watson 6
- Dalton Watson Fine Books 1
- Dana Estes & Company 1
- Daniel O'Connor 3
- Danny Books 1
- Dargaud 1
- Dargaud Editeur 1
- Dartmoor Preservation Association 1
- Darton & Co. 2
- Darton And Clark 1
- Darton And Co. 1
- Darton And Harvey 1
- David & Charles 127
- David A.H. Grayling 1
- David Bennett Books 3
- David Bennett Books Ltd. 3
- David Bridge & Co. Ltd. 1
- David Bull Publishing 1
- David C. Cook Publishing Co. 1
- David Crawford 1
- David Douglas 1
- David Fickling Books 4
- David Harris 1
- David J. Hopkin 1
- David Leader 1
- David McKay 1
- David McKay Company 8
- David Nutt 14
- David Ogilvy 1
- David R. Godine 1
- David Schutte 9
- David St John Thomas 1
- David Welch 1
- David Weston Gallery 1
- David Weston Publications 1
- Dawson Publications 1
- Dawsons Of Pall Mall 1
- Day & Son 1
- Day And Son Limited 1
- DBI Books Inc. 1
- De Walburg Pers 1
- De Wolfe-Fiske & Co. 1
- Dean 4