| Bucklow (1945 - 1950) |
Full name (in Craig 3) Cheshire, Bucklow. |
| Buckrose (1885 - 1950) |
Full name (in Craig 2,3) Yorkshire (East Riding), Buckrose |
| Bury (1832 - 1950) |
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| Bute and Northern Ayrshire (1918 - 1950) |
Full name (in Craig 3) Ayrshire and Bute, Bute and Northern |
| Caernarvon District of Boroughs (1832 - 1950) |
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| Caernarvonshire (1918 - 1950) |
Constituency of same name also existed 1832-1885. |
| Camberwell North (1885 - 1950) |
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| Camberwell North West (1918 - 1950) |
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| Camborne (1885 - 1950) |
Full name (in Craig 2,3) Cornwall, Camborne |
| Cambridge University (1832 - 1950) |
Non-geographic constituency. |
| 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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| City of London (1832 - 1950) |
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| 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. |
| Cornwall Northern (1918 - 1950) |
Full name (in Craig 3) Cornwall, Northern |
| Coventry West (1945 - 1950) |
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| Croydon South (1918 - 1950) |
Constituency of same name reformed 1955. |
| Cumberland Northern (1918 - 1950) |
Full name (in Craig 3) Cumberland, Northern |
| Derby (1832 - 1950) |
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| Derbyshire North Eastern (1885 - 1950) |
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