Publishers
- Cresset Editions 1
- Cresta Books 1
- Cricket Books 1
- Croesor Junction Press 1
- Croil 1
- Croner Publications 1
- Croom Helm 8
- Croom Helm Ltd. 1
- Crosby Lockwood 1
- Crosby Lockwood and Son 4
- Crosby Lockwood And Son Ltd 1
- Crossprint 1
- Crown Publishers 1
- Crown Publishers Inc. 3
- Crowood 2
- Crowswing Books 2
- Crystal Palace Foundation 1
- Csiro Publishing 1
- Cumberland & Westmorland Antiquarian & Archaeological Society 9
- Cumbrian Railways Association 1
- Cupples & Leon Company 1
- Curwen Books 1
- Cushing-Malloy Inc 1
- Cwmbran Community Press Ltd. 1
- Cwmni Cymraeg Foyle 1
- Cwmni Urdd Gobaith Cymru 1
- Cwmni Y. Wasg Eglwysig Gymreig 1
- Cyhoeddedig Gan D. O'Brien Owen 1
- Cyhoeddiadau Barddas 2
- Cymric Federation Press 1