Publishers
- Chatto & Windus 66
- Chatto & Windus Ltd 7
- Chelsea House Publishers 2
- Chelsea Publishing Co. 1
- Chepstow Town Council 2
- Chester County Historical Society 1
- Chester McKaige 2
- Chesterfield Borough Council 1
- Chevprime 2
- Chicago 2
- Child's Play (International) Ltd. 9
- Childhood Publications Limited 1
- Children's Special Service Mission 1
- Children's Universe 1
- Chilton Book Company 1
- China Press 11
- Chiswick Press 2
- Chooseco 1
- Choudens 1
- Chris & Cliff Tomaszewski 2
- Chris Beetles Ltd. 1
- Christian Brandstatter Verlag 1
- Christian Touring Union Limited 1
- Christie, Manson & Woods Ltd. 1
- Christoph Seigel 1
- Christopher Davies 6
- Christopher Hall 1
- Christopher Helm 5
- Christophers 2
- Chronica Botanica Company 1
- Chronicle Books 5
- Chronosports 5
- Chronosports Gsn Publishing 1
- Chrysalis Children's Books 1
- Church Missionary Society 1
- Cicada Books 1
- Circle Productions 1
- Citta Di Torino 1
- City Of Birmingham 1
- City of Bristol Museum and Art Gallery 2
- City Of Worcester 1
- Clan Enterprises 1
- Clarendon Press 10
- Clarion Books 1
- Clarkes New Press 1
- Classic 3
- Classic Publications 5
- Claude Lefrancq Editeur 2
- Clearview 1
- Clifton Books 1
- Climber's Club 2
- Clwydian-Press 1
- Clymer 3
- CMG Publishing 1
- Co-Operative Printing Sociaty Limited 1
- Co-operative Wholesale Society 1
- Coachbuilt Press 1
- Cobden-Sanderson 2
- Cobden-Sanderson Ltd. 1
- Cocorico 1
- Colin Baxter Photography Ltd. 1
- Colin Huston 1
- Colin Orchard 1
- Collection Parthenope 1
- Collectors' Books 1
- Collet's 1
- Collier Macmillan Publishers 2
- Collins 327
- Collins & Brown 1
- Collins Clear-Type Press 78
- Collins Colour Camera Books 2
- Collins Lions 1
- Collins Willow 6
- Colnaghi And Co. 1
- Colorado Railroad Museum 1
- Colour Library Books 2
- Colour Library Direct 1
- Colourbox Publishing 1
- Colourpoint Books 1
- Columbia University Press 4
- Combined Publishing 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
- Communist Party Of Great Britain 1
- Compaid Graphics 2
- Company Of Stationers 1
- Comparahatch Ltd 1
- Compassverlag 1
- Comstock Publishing Company Inc. 1
- Comyns (Publishers) Ltd. 1
- Concept Associates Ltd. 1
- Connaissance Du Rail 4
- Connor & Butler 1
- Consejo Superior De Investigaciones Cintificas 1
- Conservation Press 1
- Consiglio Nazionale Delle Ricerche 1
- Constable 9