| Kilmarnock (1918 - 1983) |
Full name (in Craig 3,4) Ayrshire and Bute, Kilmarnock |
| Kincardine and Western (1918 - 1950) |
Full name (in Craig 3) Aberdeenshire and Kincardineshire, Kincardine and Western |
| King's County (1918 - 1922) |
Constituency of same name also existed 1832-1885. This county became County Offaly after 1922. |
| Kingston upon Hull North West (1918 - 1950) |
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| Kingston upon Hull South West (1918 - 1950) |
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| Kingston upon Thames (1918 - 1997) |
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| Kinross and Western (1918 - 1950) |
Full name (in Craig 3) Perthshire and Kinross-shire, Kinross and Western |
| Lanark (1918 - 1983) |
Full name (in Craig 3,4) Lanarkshire, Lanark |
| Lanarkshire Northern (1918 - 1950) |
Constituency of same name also existed 1868-1885. |
| Leeds North East (1918) |
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| Leeds South East (1918 - 1983) |
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| Leicester East (1918 - 1950) |
Constituency of same name reformed 1974¹. |
| Leicester South (1918 - 1950) |
Seat of same name reformed 1974¹ |
| Leicester West (1918 - 1950) |
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| Leith (1918 - 1950) |
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| Leitrim (1918 - 1922) |
Constituency of same name also existed 1832-1885. |
| Lewisham East (1918 - 1950) |
Constituency of same name reformed 1974¹. |
| Lewisham West (1918 - 2010) |
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| Leyton East (1918 - 1950) |
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| Leyton West (1918 - 1950) |
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| Liverpool, Edge Hill (1918 - 1983) |
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| Liverpool, Fairfield (1918 - 1950) |
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| Liverpool Wavertree (1918 - 1983) |
Consituency of same name reformed 1997. |
| 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. |