| Colchester |
Full name (in Craig 3,4) Essex, Colchester. Constitutency of same name reformed 1997. |
| Colchester North |
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| Colchester South and Maldon |
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| Coleraine |
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| Colne Valley |
Full name (in Craig 2,3,4) Yorkshire (West Riding), Colne Valley |
| Combined English Universities |
Non-geographic constituency. |
| Combined Scottish Universities |
Non-geographic constituency. |
| Congleton |
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| Consett |
Full name (in Craig 3,4) Durham, Consett |
| Conway |
Full name (in Craig 4) Caernarvonshire, Conway. Revision in 1983 was to spelling (Conwy) rather than major boundary change. |
| Conwy |
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| Copeland |
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| Corby |
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| Corby and East Northamptonshire |
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| Cork [borough] |
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| Cork [county] |
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| Cork East |
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| Cork Mid |
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| Cork North |
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| Cork North East |
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| Cork South |
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| Cork South East |
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| Cork West |
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| Cornwall Eastern |
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| Cornwall North |
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