| Caernarvonshire (1918 - 1950) |
Constituency of same name also existed 1832-1885. |
| Caerphilly (1918) |
Full name (in Craig 3,4) Glamorganshire, Caerphilly |
| Caithness and Sutherland (1918 - 1997) |
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| Camberwell North West (1918 - 1950) |
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| Cannock (1918 - 1983) |
Full name (in Craig 3,4) Staffordshire, Cannock |
| Cardiff Central (1918 - 1950) |
Constituency of same name reformed 1983. |
| Cardiff East (1918 - 1950) |
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| Cardiff South (1918 - 1950) |
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| Carmarthen (1918 - 1997) |
Full name (in Craig 3,4) Carmarthenshire, Carmarthen |
| Carshalton (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 3,4) Surrey, Carshalton |
| Chislehurst (1918 - 1997) |
Full name (in Craig 3,4) Kent, Chislehurst |
| Cirencester and Tewkesbury (1918 - 1997) |
Full name (in Craig 3,4) Gloucestershire, Cirencester and Tewkesbury |
| Clackmannan and Eastern (1918 - 1950) |
Full name (in Craig 3) Stirlingshire and Clackmannanshire, Clackmannan and Eastern |
| Clay Cross (1918 - 1950) |
Full name (in Craig 3) Derbyshire, Clay Cross |
| Coatbridge (1918 - 1950) |
Full name (in Craig 3) Lanarkshire, Coatbridge |
| Combined English Universities (1918 - 1950) |
Non-geographic constituency. |
| Combined Scottish Universities (1918 - 1950) |
Non-geographic constituency. |
| Consett (1918 - 1983) |
Full name (in Craig 3,4) Durham, Consett |
| Cornwall Northern (1918 - 1950) |
Full name (in Craig 3) Cornwall, Northern |
| Croydon North (1918 - 1955) |
Constituency of same name reformed 1997. |
| Croydon South (1918 - 1950) |
Constituency of same name reformed 1955. |
| Cumberland Northern (1918 - 1950) |
Full name (in Craig 3) Cumberland, Northern |
| Daventry (1918) |
Full name (in Craig 3) Northamptonshire (and the Soke of Peterborough), Daventry |
| Denbigh (1918 - 1983) |
Full name (in Craig 3,4) Denbighshire, Denbigh |
| Don Valley (1918 - 2024) |
Full name (in Craig 3,4) Yorkshire (West Riding), Don Valley |