Publishers
- C. Titcombe 1
- C.A. Kaemmerer 1
- C.A. Kochs 1
- C.A. Publications Ltd. 7
- C.A. Publications, Ltd. 2
- C.A. Reitzels 1
- C.F. Braun & Co. 1
- C.I. Thomas 1
- C.S.S.M. 1
- C.W. Faulkner & Co. Ltd. 1
- C&o Historical Society 1
- Cabi 1
- Cabi Publishing 2
- Cadell & Davies 2
- Cadogan Books 1
- CADW 1
- Caerwent Historic Trust 1
- Calder Walker Associates 1
- Calla Editions 1
- Calm Productions 1
- Cambrian Archaeological Association 14
- Cambrian Ornithological Society 1
- Cambridge Scholars Press Ltd. 1
- Cambridge University Press 97
- Camden Miniature Steam Services 1
- Cameron May 1
- Camps & Tours Union 1
- Canadian National Railways 1
- Canav Books 1
- Candle Books 1
- Candlewick Press 1
- Canongate 2
- Canongate Press 1
- Canongate Publishing Limited 1
- Cape Times 1
- Capital Transport 33
- Capitol Publishing Co. 1
- Caradon District Council 1
- Cardiff Council 1
- Cardiff University 1
- Carey Press 2
- Carl Fromme 1
- Carl Hanser 1
- Carl Winter 1
- Carlton Books Limited 3
- Carlton Press Inc. 1
- Carmarthan Journal 1
- Carmarthenshire County Council 1
- Carnegie Publishing Ltd. 3
- Carnival 1
- Caroline Downey 1
- Carp Fishing News Ltd 1
- Carreg Gwalch 1
- Carwal Publications, Ltd. 1
- Casemate 2
- Casemate Publishers 3
- Cassell 12
- Cassell & Co. 13
- Cassell & Co. Ltd. 19
- Cassell & Company Limited 35
- Cassell & Company Ltd 25
- Cassell Illustrated 1
- Cassell Petter & Galpin 6
- Cassell, Petter And Galpin 1
- Cassell, Petter, Galpin & Co. 1
- Castell Brothers 4
- Castell Brothers Ltd. 7
- Casterman 14
- Castle Books 1
- Castlemead Publications 1
- Catalpa Press Ltd 1
- Caxton Editions 3
- Caxton Publishing Co. 1
- Caxton Publishing Company Limited 1
- CCS Books 1
- Cecil Palmer 4
- Cef Books 1
- Centaur Press Ltd 1
- Centennial Publishing 1
- Center Of Military History United States Army 1
- Central Books Limited 3
- Centre For Alternative Technology 1
- Century 2
- Century Benham 1
- Century Hutchinson Ltd. 2
- Century Publishing 2
- Cerberus 1
- Cetre Et Fondation Le Grand-Cachot 1
- Ch. R. & Cie 1
- Chad Valley Books 1
- Chadworth Limited 1
- Chaffcutter Books 3
- Chalford 3
- Challenger Publications 12
- Chambre De Commerce De Grenoble 1
- Chameleon Publishing 1
- Champlin Fighter Museum Press 1
- Chancellor Press 7
- Channel 4 2
- Chantry Press 1