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| Christine Swift |
| Christopher Davies |
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| Christopher Johnson |
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| CIGRE |
| CILIPS |
| Cinema Theatre Association & British Film Inst |
| Cinque Port |
| Circadian |
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| City of Westminster Archives |
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| City Press |
| City University |
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| Civil Engineering Publications |
| Clackmannan District Libraries |
| Clare Son & Co |
| Clarendon Press |
| Clarion Printers |
| Clark & Medd |
| Clark University |
| Clarke & Co and Wm Mortimer |
| Clarke & Sherwell |
| Classfern |
| Claude Cox |
| CLE Print |
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| Clerke & Cockeran |
| Clevedon Pier Trust |
| Cleveland Bridge & Engineering Co Ltd |
| Cleveland Council |
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| Cleveland Industrial Archaeology Society |
| Clifton Suspension Bridge Trust |
| Clio Publishing |
| Clipstone Publishing |
| Cloister Press |
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| Clowes |
| Cluff & Son |
| Clunes Museum |
| Cluny Lace Co Ltd |
| Clwyd County Council |
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| CMP Information |
| Co-operative College |
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| Co-operative Heritage Society |
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| Co-partnership Association |
| Co-partnership Publishers Ltd |
| Coach Publishing House and Weald & Downland Open Air Museum |
| Coalbrookdale Institute |
| Coastal Publications |
| Cobden Sanderson |
| Colchester & Essex Museum |
| Colchester Archaeology Group |
| Coleraine Bookshop |
| Coleshill Civic Society |
| Colin Baxter Photography |
| Colin Venton |
| Colin Wright |
| Collector Grade Publications |
| Collectors' Books |
| College of All Saints |
| College of Librarianship, Wales |
| Collier Books |
| Collier Macmillan |
| Colliery Guardian Co |
| Collins |
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| Collis, J R |
| Colne Fishery Board |
| Colne Oyster Fishery |
| Colombus |
| Colourpoint Books |
| Colston & Co |
| Colt Books |
| Columbia College |
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| Columbia University Press |
| Columbine Press |
| Columbus |
| Colville |
| Colvilles Ltd |
| COMA (Year Book) Ltd |
| Combe Down Heritage Society |
| Combe Martin Local History Group |
| Combridges |
| Comedia Publishing |
| Comet Centenary Celebration Committee |
| Comet Press |
| Comite Departemental du Tourism du Gers |
| Comite pour l'Histoire Economique de la France |
| Commercial Union Insurance |
| Commercial Vehicle & Road Transport Club |
| Commissioners of the Exhibition |
| Committee for Rescue Archaeology in Avon, Gloucestershire & Somerset |
| Commodity Analysis Ltd |
| Comp Air |
| Compaid Graphics |
| CompAir |
| Company of Hostman of Newcastle upon Tyne |
| Company of Launderers |
| Compendium |
| Compton |
| Compton Press |
| Concrete Publications |
| Condie Publishers |
| Confederation of Shipbuilding & Engineering Unions |
| Congleton Museum |
| Connect Publishing |
| Connoisseur Crafts |
| Connor & Butler |
| Conran Foundation |
| Conran Octopus |
| Conservative Political Centre |
| Conservators of Epping Forest |
| Constable |
| Constable & Robinson Ltd |
| Constanduros Press |
| Constructional Steelwork Export Group |
| Consumer Gaslight Co |
| Contact Publications |
| Contender |
| Continuum |
| Continuum International Publishers |
| Control Column |
| Conway & Colwyn Joint Water Supply District? |
| Conway Maritime Press |
| Conway Maritime Press with Exeter University |
| Cook Hammond & Kell |
| Coombe Cottage Books |
| Coombe Springs Press |
| Copenhagen Business School Press |
| Copp Clark |
| Copyright Publishing |
| Cora Weaver |
| Corbitt & Hunter |
| Corby Historical Society |
| Corgi |
| Cork University Press |
| Cormorant Publishing |
| Cornell University |
| Cornell University Press |
| Corning Museum of Glass |
| Cornish Brothers |
| Cornish Brothers for Corporation of Birmingham |
| Cornish Chamber of Mines |
| Cornish Editions |
| Cornish Hillside Publications |
| Cornishman |
| Cornmarket Press |
| Cornwall and West Devon Mining Landscape World Heritage Site |
| Cornwall Archaeological Unit |
| Cornwall Books |
| Cornwall Editions |
| Cornwall Trust for Nature Conservation |
| Coronet Books |
| Corporation of London |
| Corran Publications |
| Corris Railway Society |
| Cortex Designs |
| Cory, Adams & Mackay |
| Cosmic Elk |
| Costello with Saddlers Co |
| Cotswold Living Publications |
| Cottage Press |
| Cotterell |
| Cotteswold Naturalists' Field Club |
| Coultas & Volans |
| Coulton & Co |
| Council for British Archaeology |
| Council for British Archaeology & Historic Scotland |
| Council for Cultural Development |
| Council for Ironfoundry Associations |
| Council for Preservation of Business Archives |
| Council of Clothing Trade Associations |
| Council of Industrial Design |
| Council of Iron Foundry Association |
| Council of the City of Chester |
| Counter Information Service |
| Country Books |
| Country Life |
| Country Life for Thurloe Estates Ltd |
| Countryside Books |
| County Borough of Middlesbrough |
| County Council Times |
| County Records Committee of Glamorgan |
| Countyvise |
| Countyvise & Wirral Central Library |
| Courage |
| Courier & Co |
| Courier Press |
| Courtauld Institute |
| Courtauld Institute Gallery |
| Courtaulds |
| Covent Garden Market Authority |
| Coventry Arts & Heritage |
| Coventry City Council |
| Coventry Evening Telegraph |
| Coventry Newspapers |
| Coventry Newspapers for the Society |
| Coventry Polytechnic |
| Coventry Polytechnic, Centre for Business History |
| Coventry Textile Society |
| Coventry Through Time |
| Coventry University and Lanchester Legacy Ltd |
| Coventry University Enterprises |
| Coventry Watch Museum Project |
| Cover Publishing Ltd for W H Smith |
| Covici |
| Cowbridge Publishing |
| Cowell |
| Cox & Sharland |
| Cox Family Enterprise Centre |
| CPC Press |
| CPL Books |
| CPS Press |
| Crabtree Press |
| Crabtree Society |
| Crabwell |
| Craft Press |
| Crafts Council |
| Crafts Study Centre |
| Craftsmen Publishing Co |
| Crain Services |
| Crampton & Sons |
| Cranbrook & Sissinghurst Local History Society |
| Cranfield Institute of Technology |
| Cranfield Press |
| Cranford Press |
| Crawcour Books |
| CRD Employee Communications for BT |
| CreateSpace |
| Creation Books |
| Creative Edge |
| Creative Educational Press |
| Creative Media Publishing |
| Crecy Publishing |
| Creeds |
| Cresset Library |
| Cresset Press |
| Creuddyn Publications |
| Crimson Publishing |
| Crisp Malting |
| Crofton E Gane |
| Cromford Canal Co |
| Crompton Council |
| Crompton Press Ltd |
| Croom Helm |
| Crosby Lockwood |
| Crosby, Lockwood, Staples |
| Cross |
| Cross Publishing |
| Crossness Engines Trust |
| Crossprint |
| Crown Cork Co Ltd |
| Crown Publishers |
| Crowood |
| Crowood Auto Classic |
| Crowther & Goodman |
| Croydon Airport Society |
| Croydon Libraries Committee |
| CRS |
| Crucible Books |
| Cruithne Press |
| Cryfield Press |
| CSE Books |
| CSY Publishing |
| Cualann |
| Culshaw & Co |
| Cultural Development Partnership |
| Cultureshock |
| Culva House Publications |
| Cumberland & Westmorland Antiquarian & Archaeological Society |
| Cumberland & Westmorland Herald |
| Cumberland Development Council |
| Cumbria Amenity Trust Mining History Society |
| Cumbria Industrial History Society |
| Cumbrian Railway Association |
| Curtis |
| Curwen Press |
| Curzon Press |
| Cusworth Hall Museum |
| CWS Membership Services |
| Cyan |
| Cycle Trades Publishing Co |
| Cyclethings |
| Cygnet |
| Cygnus Arts |