| Hereford (1832 - 2010) |
Full name (in Craig 3,4) Herefordshire, Hereford |
| Herefordshire (1832 - 1885) |
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| Hertford (1832 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 2,3,4) Hertfordshire, Hertford |
| Hertfordshire (1832 - 1885) |
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| Honiton (1832 - 1868) |
Disenfranchised 1868. Constituency of same name existed 1885- |
| Horsham (1832 - 1918) |
Full name (in Craig 2,3,4) Sussex (West), Horsham. Also known as Sussex North Western, 1885-?. Constituency of same name existed 1945-1974ยน, also reformed 1983. |
| Huddersfield (1832 - 1950) |
Constituency of same name reformed 1983. |
| Huntingdon (1832 - 1918) |
Full name (in Craig 2) Huntingdonshire, Huntingdon. Constituency of same name reformed 1983. |
| Huntingdonshire (1832 - 1885) |
Constituency of same name also existed 1918-1983. |
| Hythe (1832 - 1950) |
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| Inverness District of Burghs (1832 - 1918) |
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| Inverness-shire (1832 - 1918) |
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| Ipswich (1832) |
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| Isle of Wight (1832 - 2024) |
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| Kendal (1832 - 1918) |
Full name (in Craig 2) Westmoreland, Kendal |
| Kent Eastern (1832 - 1885) |
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| Kent Western (1832 - 1885) |
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| Kerry (1832 - 1885) |
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| Kidderminster (1832 - 1983) |
Full name (in Craig 3,4) Worcestershire, Kidderminster |
| Kildare (1832 - 1885) |
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| Kilkenny [borough] (1832 - 1918) |
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| Kilkenny [county] (1832 - 1885) |
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| Kilmarnock District of Burghs (1832 - 1918) |
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| Kincardineshire (1832 - 1918) |
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| King's County (1832 - 1885) |
Constituency of same name also existed 1918-1922. This county became County Offaly after 1922. |