| Lincolnshire, parts of Lindsey (1832 - 1868) |
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| Linlithgowshire (1832 - 1950) |
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| Lisburn (1832 - 1885) |
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| Liskeard (1832 - 1885) |
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| Liverpool (1832 - 1885) |
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| Londonderry [borough] (1832 - 1922) |
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| Londonderry [county] (1832 - 1885) |
Constituency of same name also existed 1922-1983. |
| London University (1832 - 1950) |
Non-geographic constituency. |
| Longford (1832 - 1885) |
Constituency of same name also existed 1918-1922. |
| Louth [county, Ireland] (1832 - 1885) |
Constituency of same name also existed 1918-1922. |
| Ludlow (1832 - 2024) |
Full name (in Craig 2,3,4) Shropshire, Ludlow |
| Lyme Regis (1832 - 1885) |
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| Lymington (1832 - 1885) |
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| Macclesfield (1832) |
Full name (in Craig 2,3,4) Cheshire, Macclesfield |
| Maidstone (1832 - 1997) |
Full name (in Craig 3,4) Kent, Maidstone |
| Maldon (1832 - 1983) |
Full name (in Craig 2,3,4) Essex, Maldon |
| Mallow (1832 - 1885) |
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| Malmesbury (1832 - 1885) |
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| Malton (1832 - 1885) |
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| Manchester (1832 - 1885) |
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| Marlborough (1832 - 1885) |
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| Marylebone (1832 - 1885) |
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| Mayo (1832 - 1885) |
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| Meath (1832 - 1885) |
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| Merionethshire (1832 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |