Publishers
- Children's Universe 1
- Chiron Publications 1
- Chiswick Press 6
- Chivers & Sons Ltd. 2
- Chorley & Pickersgill Ltd 1
- Chris Beetles Gallery 1
- Chris Beetles Ltd. 5
- Chris Sladden Books 1
- Christian Stoll 1
- Christie, Manson & Woods Ltd. 1
- Christie's 1
- Christoph Seigel 1
- Christopher Davies 10
- Christopher Forbes 1
- Christopher Helm 48
- Christophers 2
- Chronica Botanica Company 1
- Chronicle Books 10
- Chronosports 5
- Chronosports Gsn Publishing 1
- Chrysalis Children's Books 1
- Church Missionary Society 1
- Church Of England Zenana Missionary Society 1
- Cicada Books 1
- Cicerone Press 3
- Cinebook Ltd 1
- Cirencester Newspaper Company 1
- Citta Di Torino 1
- City Of Birmingham 1
- City Of Portsmouth 1
- City Of Worcester 1
- Civitas 1
- Claremont Books 1
- Clarendon Press 12
- Clarion Books 1
- Clarke Printing 3
- Clarkes New Press 2
- Classic 3
- Classic Publications 5
- Claude Lefrancq Editeur 1
- Claye, Brown & Claye 1
- Clearview 1
- Clematis Press Limited 2
- Clement Ingleby 1
- Clifton Books 1
- Climber's Club 2
- Clive Holloway Books 2
- Clowes And Sons 1
- Clwydian-Press 1
- Clyard Novella Limited 1
- Clymer 2
- CMG Publishing 2
- Co-Operative Printing Sociaty Limited 1
- Co-operative Wholesale Society 2
- Cobden-Sanderson 1
- Cobham Plc 1
- Coch-Y-Bonddu Books 1
- Cocorico 1
- Coles Publishing Company 1
- Colin Baxter Photography Ltd. 1
- Colin Buchanan And Partners 1
- Collection Parthenope 1
- Collectors' Books 1
- College St. Centenary Committee 1
- Collet's 1
- Collier Macmillan Publishers 1
- Collins 611
- Collins & Harvill 2
- Collins & Harvill Press 1
- Collins and Harvill 2
- Collins Clear-Type Press 110
- Collins Colour Camera Books 1
- Collins Lions 2
- Collins Voyager 1
- Collins Willow 4
- Colnaghi And Co. 1
- Colnet 2
- Colorgravure 1
- Colour Library Books 2
- Colour Library Direct 3
- Colourbox Publishing 1
- Colourpoint 1
- Colt Books 1
- Columbia University Press 5
- Combined Publishing 1
- Command And Staff College 1
- Commission Of Conservation Canada 1
- Commonwealth Agricultural Bureaux 1
- Commonwealth Scientific And Industrial Research Organization 1
- Commonwealth War Graves Commission 3
- Compaid Graphics 1
- Company Of Stationers 1
- Compassverlag 1
- Comstock Publishing Associates 3
- Comstock Publishing Company Inc. 1
- Concord Publications Co. 1
- Connaissance Du Rail 4
- Consejo Superior De Investigaciones Cintificas 1
- Conservation Press 1
- Consiglio Nazionale Delle Ricerche 1