Political organisations
| Name | Type | Notes |
|---|---|---|
| Council of Europe | Miscellaneous | |
| Council of Europe | Miscellaneous | |
| Council of Europe | International body | |
| Council of Incorporated Law Society | Trade group | |
| Council of Progress Trusts | Miscellaneous | |
| Council of Scottish Liberal Associations | Party group | |
| Country Landowners' Association | Pressure group | |
| Countryside Alliance | Miscellaneous | |
| County Councils Association | Pressure group | |
| Cymrodorion Society | Miscellaneous | |
| Development Association | Miscellaneous | |
| Discharged Prisoners' Aid Society | Pressure group | |
| Druids | Miscellaneous | |
| Durham Political Reform Association | Pressure group | |
| East India Association of Founders | Trade group | |
| East Midlands Council Nat Lib Org | Party group | |
| Economic League | Pressure group | |
| Educational Association | Miscellaneous | |
| Educational Institute | Trade group | |
| Electrical Development Association | Miscellaneous |