| Norwich (1832 - 1950) |
Writ suspended 1875-1880. |
| Nottingham (1832 - 1885) |
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| Nottinghamshire Northern (1832 - 1885) |
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| Nottinghamshire Southern (1832 - 1885) |
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| Oldham (1832 - 1950) |
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| Orkney and Shetland (1832) |
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| Oxford (1832 - 1983) |
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| Oxfordshire (1832 - 1885) |
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| Oxford University (1832 - 1950) |
Non-geographic constituency. |
| Paisley (1832 - 1983) |
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| Peeblesshire (1832 - 1868) |
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| Pembroke District of Boroughs (1832 - 1885) |
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| Pembrokeshire (1832 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Penryn and Falmouth (1832 - 1950) |
Full name (in Craig 3) Cornwall, Penryn and Falmouth |
| Perth (1832 - 1950) |
Full name (in Craig 3) Perthshire and Kinross-shire, Perth. Constituency of same name reformed 1997. |
| Perthshire (1832 - 1885) |
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| Peterborough (1832) |
Full name (in Craig 4) Northamptonshire (and the Soke of Peterborough), Peterborough |
| Petersfield (1832 - 1983) |
Full name (in Craig 2,3,4) Hampshire, Petersfield |
| Plymouth (1832 - 1918) |
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| Pontefract (1832 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 3) Yorkshire (West Riding), Pontefract |
| Poole (1832 - 1885) |
Constituency of same name reformed 1950. |
| Portarlington (1832 - 1885) |
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| Portsmouth (1832 - 1918) |
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| Preston (1832 - 1950) |
Constituency of same name reformed 1983. |
| Queen's County (1832 - 1885) |
Constituency of same name also existed 1918-1922. This county became County Laois after 1922. |