| Lanark (1918 - 1983) |
Full name (in Craig 3,4) Lanarkshire, Lanark |
| Lanarkshire North (1950 - 1983) |
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| Leeds South (1885 - 1983) |
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| Leeds South East (1918 - 1983) |
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| Leek (1885 - 1983) |
Full name (in Craig 2,3,4) Staffordshire, Leek |
| Lichfield and Tamworth (1950 - 1983) |
Full name (in Craig 4) Staffordshire, Lichfield and Tamworth |
| Liverpool, Edge Hill (1918 - 1983) |
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| Liverpool, Kirkdale (1885 - 1983) |
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| Liverpool, Scotland Exchange (1974 - 1983) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Liverpool, Toxteth (1950 - 1983) |
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| Liverpool Wavertree (1918 - 1983) |
Consituency of same name reformed 1997. |
| Londonderry [county] (1922 - 1983) |
Constituency of same name also existed 1832-1885. |
| Louth [borough, Lincolnshire] (1885 - 1983) |
Full name (in Craig 2,3,4) Lincolnshire and Rutlandshire (parts of Lindsey), Louth |
| Lowestoft (1885 - 1983) |
Full name (in Craig 2,3,4) Suffolk, Lowestoft |
| Luton East (1974 - 1983) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Luton West (1974 - 1983) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Maldon (1832 - 1983) |
Full name (in Craig 2,3,4) Essex, Maldon |
| Manchester, Ardwick (1918 - 1983) |
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| Manchester, Moss Side (1918 - 1983) |
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| Manchester, Openshaw (1955 - 1983) |
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| Melton (1885 - 1983) |
Full name (in Craig 2,3,4) Leicestershire, Melton |
| Merioneth (1974 - 1983) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Merthyr Tydfil (1950 - 1983) |
Constituency of same name also existed 1832-1918. |
| Merton Mitcham and Morden (1974 - 1983) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Middleton and Prestwich (1918 - 1983) |
Full name (in Craig 3,4) Lancashire, Middleton and Prestwich |