| Norfolk South West (1950) |
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| Northamptonshire South (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 4) Northamptonshire (and the Soke of Peterborough), South |
| North Angus and Mearns (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 4) Aberdeenshire and Kincardineshire, North Angus and Mearns |
| North Fylde (1950 - 1983) |
Full name (in Craig 4) Lancashire, North Fylde |
| Norwich North (1950) |
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| Norwich South (1950) |
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| Nottingham North West (1950 - 1955) |
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| Oldbury and Halesowen (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Oldham East (1950 - 1997) |
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| Oldham West (1950 - 1997) |
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| Penrith and The Border (1950 - 2024) |
Full name (in Craig 4) Cumberland, Penrith and the Border |
| Perth and East Perthshire (1950 - 1983) |
Full name (in Craig 4) Perthshire and Kinross-shire, Perth and East Perthshire |
| Poole (1950) |
Constituency of same name also existed 1832-1885. |
| Poplar (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Portsmouth Langstone (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Portsmouth West (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Preston North (1950 - 1983) |
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| Preston South (1950 - 1983) |
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| Pudsey (1950 - 2024) |
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| Reading North (1950 - 1955) |
Constituency of same name also existed 1974¹-1983. |
| Reading South (1950 - 1955) |
Constituency of same name also existed 1974¹-1983. |
| Renfrewshire East (1950 - 1983) |
Constituency of same name formed 2005. |
| Renfrewshire West (1950 - 1983) |
Seat of same name reformed 1997 |
| Rochester and Chatham (1950 - 1983) |
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| Rowley Regis and Tipton (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |