Publishers
- Children's Digest Publications Ltd. 1
- Children's Leisure Products Ltd. 1
- Children's Special Service Mission 1
- Children's Universe 1
- Chilton Book Company 1
- China Press 14
- Chiswick Press 5
- Chivers & Sons Ltd. 1
- Choudens 1
- Chris Beetles Gallery 1
- Chris Beetles Ltd. 3
- Christian Stoll 1
- Christie, Manson & Woods Ltd. 1
- Christoph Seigel 1
- Christopher Davies 11
- Christopher Helm 22
- Christophers 2
- Chronica Botanica Company 1
- Chronicle Books 8
- Chronicle Communications Ltd. 1
- Chronosports 8
- Chronosports Gsn Publishing 1
- CHT Publishing 1
- Church Missionary Society 1
- Church Of England Zenana Missionary Society 1
- Cicada Books 1
- Cicerone Press 1
- Cirencester Newspaper Company 1
- Cirrus Associates 1
- Citta Di Torino 1
- Citta' Di Venezia 1
- City Of Birmingham 1
- City Of Birmingham Education Department 1
- City Of Portsmouth 1
- City Of Worcester 1
- City Press 1
- Claremont Books 1
- Clarendon Press 14
- Clarion Books 1
- Clarkes New Press 1
- Classic 1
- Classic Publications 4
- Clearview 1
- Clement Ingleby 1
- Clifton Books 1
- Climber's Club 1
- Clo Ollscoil Na Banriona 1
- Cloister Press 1
- Clwydian-Press 1
- Clymer 2
- CMG Publishing 2
- Co-operative Wholesale Society 2
- Coachbuilt Press 1
- Cobden-Sanderson 1
- Cocorico 1
- Colin Baxter Photography Ltd. 1
- Colin Brent Books 1
- Colin Huston 1
- Colin Orchard 1
- Collection Parthenope 1
- Collet's 1
- Collier Macmillan Publishers 2
- Collins 430
- Collins and Harvill 3
- Collins Clear-Type Press 85
- Collins Colour Camera Books 1
- Collins Lions 1
- Collins Voyager 1
- Collins Willow 5
- Colmans Foods 1
- Colnaghi And Co. 1
- Colorado Railroad Museum 1
- Colour Library Books 2
- Colour Library Books Ltd. 1
- Colour Library Direct 2
- Colourbox Publishing 1
- Colourpoint 1
- Columbia University Press 5
- Colwood Press Ltd 1
- Comma International Biological Systems 1
- Commission Of Conservation Canada 1
- Commonwealth Agricultural Bureaux 1
- Commonwealth Scientific And Industrial Research Organization 1
- Commonwealth War Graves Commission 2
- Company Of Stationers 1
- Compassverlag 1
- Comstock Publishing Associates 1
- Comstock Publishing Company Inc. 1
- Concept Associates Ltd. 1
- Concord Publications Co. 1
- Connaissance Du Rail 4
- Consejo Superior De Investigaciones Cintificas 1
- Conservation Press 1
- Consiglio Nazionale Delle Ricerche 1
- Constable 13
- Constable & Co. Ltd. 25
- Constable and Company Ltd. 23
- Constable Young Books 3
- Constable Young Books Ltd. 1
- Continuum 3