| Neath (1918 - 2024) |
Full name (in Craig 3,4) Glamorganshire, Neath |
| Nelson and Colne (1918 - 1983) |
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| Newcastle upon Tyne Central (1918 - 2024) |
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| Newcastle upon Tyne East (1918 - 1997) |
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| Newcastle upon Tyne North (1918) |
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| Newcastle upon Tyne West (1918 - 1983) |
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| New Forest and Christchurch (1918 - 1950) |
Full name (in Craig 3) Hampshire, New Forest and Christchurch |
| Newport [Monmouthshire/Gwent] (1918 - 1983) |
Previously part of Monmouth District of Boroughs (constituency 959). |
| Nottingham Central (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Ogmore (1918 - 2024) |
Full name (in Craig 3,4) Glamorganshire, Ogmore |
| Orpington (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 3,4) Kent, Orpington. Constituency of same name reformed 1983. |
| Peebles and Southern (1918 - 1950) |
Full name (in Craig 3) Midlothian and Peeblesshire, Peebles and Southern |
| Penistone (1918 - 1983) |
Full name (in Craig 3,4) Yorkshire (West Riding), Penistone |
| Penrith and Cockermouth (1918 - 1950) |
Full name (in Craig 3) Cumberland, Penrith and Cockermouth |
| Plymouth, Devonport (1918 - 2010) |
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| Plymouth, Drake (1918 - 1950) |
Seat of same name existed 1974¹-1997. |
| Plymouth, Sutton (1918 - 2010) |
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| Pontypool (1918 - 1983) |
Full name (in Craig 3,4) Monmouthshire, Pontypool |
| Pontypridd (1918) |
Full name (in Craig 3,4) Glamorganshire, Pontypridd |
| Poplar Bow and Bromley (1918 - 1950) |
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| Poplar South Poplar (1918 - 1950) |
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| Portsmouth Central (1918 - 1950) |
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| Portsmouth North (1918 - 1950) |
Constituency of same name reformed 1974¹. |
| Portsmouth South (1918) |
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| Pudsey and Otley (1918 - 1950) |
Full name (in Craig 3) Yorkshire (West Riding), Pudsey and Otley |