| Leicester West (1918 - 1950) |
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| Leith (1918 - 1950) |
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| Lewisham East (1918 - 1950) |
Constituency of same name reformed 1974ยน. |
| Leyton East (1918 - 1950) |
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| Leyton West (1918 - 1950) |
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| Lichfield (1832 - 1950) |
Full name (in Craig 2,3) Staffordshire, Lichfield. Constituency of same name reformed 1997. |
| Linlithgowshire (1832 - 1950) |
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| Liverpool, East Toxteth (1885 - 1950) |
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| Liverpool, Everton (1885 - 1950) |
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| Liverpool, Fairfield (1918 - 1950) |
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| Liverpool, West Toxteth (1885 - 1950) |
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| Llandaff and Barry (1918 - 1950) |
Full name (in Craig 3) Glamorganshire, Llandaff and Barry |
| Llanelly (1918 - 1950) |
Full name (in Craig 3) Carmarthenshire, Llanelly. Spelling changed to Llanelli (q.v.) in 1950 - not strictly a redistribution. |
| London University (1832 - 1950) |
Non-geographic constituency. |
| Lonsdale (1918 - 1950) |
Full name (in Craig 3) Lancashire, Lonsdale |
| Manchester, Hulme (1918 - 1950) |
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| Manchester, Platting (1918 - 1950) |
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| Manchester, Rusholme (1918 - 1950) |
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| Manchester South (1885 - 1950) |
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| Merthyr Tydfil Aberdare (1918 - 1950) |
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| Merthyr Tydfil Merthyr (1918 - 1950) |
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| Midlothian and Peeblesshire Northern (1918 - 1950) |
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| Montrose District of Burghs (1832 - 1950) |
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| Mossley (1918 - 1950) |
Full name (in Craig 3) Lancashire, Mossley |
| New Forest and Christchurch (1918 - 1950) |
Full name (in Craig 3) Hampshire, New Forest and Christchurch |